diff --git a/lib/main.coffee b/lib/main.coffee
index 0d2f8455..7b96def1 100644
--- a/lib/main.coffee
+++ b/lib/main.coffee
@@ -1,7 +1,4 @@
 {Disposable} = require('atom')
-Provider = require('./provider')
-Suggestion = require('./suggestion')
-{deprecate} = require('grim')
 
 module.exports =
   config:
@@ -120,28 +117,6 @@ module.exports =
     @autocompleteManager?.dispose()
     @autocompleteManager = null
 
-  registerProviderForEditorView: (provider, editorView) ->
-    @registerProviderForEditor(provider, editorView?.getModel())
-
-  # Private: Finds the autocomplete for the given TextEditor
-  # and registers the given provider
-  #
-  # provider - The new {Provider}
-  # editor - The {TextEditor} we should register the provider with
-  registerProviderForEditor: (provider, editor) ->
-    return unless @autocompleteManager?.providerManager?
-    return unless editor?.getGrammar()?.scopeName?
-    deprecate('registerProviderForEditor and registerProviderForEditorView are no longer supported. Please switch to the new API: https://github.com/atom-community/autocomplete-plus/wiki/Provider-API')
-    return @getAutocompleteManager().providerManager.registerLegacyProvider(provider, '.' + editor?.getGrammar()?.scopeName)
-
-  # Private: unregisters the given provider
-  #
-  # provider - The {Provider} to unregister
-  unregisterProvider: (provider) ->
-    return unless @getAutocompleteManager()?.providerManager?
-    deprecate('unregisterProvider is no longer supported. Please switch to the new API: https://github.com/atom-community/autocomplete-plus/wiki/Provider-API')
-    @getAutocompleteManager().providerManager.unregisterLegacyProvider(provider)
-
   getAutocompleteManager: ->
     if @activateTimeout?
       clearTimeout(@activateTimeout)
@@ -151,9 +126,6 @@ module.exports =
     @autocompleteManager = new AutocompleteManager()
     return @autocompleteManager
 
-  Provider: Provider # TODO: This is deprecated, and will be removed soon
-  Suggestion: Suggestion # TODO: This is deprecated, and will be removed soon
-
   #  |||              |||
   #  vvv PROVIDER API vvv
 
diff --git a/lib/provider-manager.coffee b/lib/provider-manager.coffee
index 24b80315..bfdcbf7c 100644
--- a/lib/provider-manager.coffee
+++ b/lib/provider-manager.coffee
@@ -4,8 +4,6 @@ _ = require('underscore-plus')
 Uuid = require('node-uuid')
 SymbolProvider = require('./symbol-provider')
 FuzzyProvider = require('./fuzzy-provider')
-Suggestion = require('./suggestion')
-Provider = require('./provider')
 
 module.exports =
 class ProviderManager
@@ -13,13 +11,11 @@ class ProviderManager
   fuzzyRegistration: null
   store: null
   subscriptions: null
-  legacyProviderRegistrations: null
   globalBlacklist: null
 
   constructor: ->
     @subscriptions = new CompositeDisposable
     @globalBlacklist = new CompositeDisposable
-    @legacyProviderRegistrations = new WeakMap
     @providers = new Map
     @store = new ScopedPropertyStore
     @subscriptions.add(atom.config.observe('autocomplete-plus.enableBuiltinProvider', (value) => @toggleFuzzyProvider(value)))
@@ -37,7 +33,6 @@ class ProviderManager
     @store = null
     @providers?.clear()
     @providers = null
-    @legacyProviderRegistrations = null
 
   providersForScopeChain: (scopeChain) =>
     return [] unless scopeChain?
@@ -93,9 +88,6 @@ class ProviderManager
   isValidProvider: (provider) ->
     return provider? and provider.requestHandler? and typeof provider.requestHandler is 'function' and provider.selector? and provider.selector isnt '' and provider.selector isnt false
 
-  isLegacyProvider: (provider) ->
-    return provider? and provider instanceof Provider
-
   providerUuid: (provider) =>
     return false unless provider?
     return false unless @providers.has(provider)
@@ -174,43 +166,3 @@ class ProviderManager
 
   # ^^^ PROVIDER API ^^^
   # |||              |||
-
-  # For Legacy use only!!
-  registerLegacyProvider: (legacyProvider, selector) =>
-    return unless legacyProvider? and legacyProvider.buildSuggestionsShim?
-    return unless selector? and selector.trim() isnt ''
-
-    legacyProviderRegistration = @legacyProviderRegistrations.get(legacyProvider.constructor)
-
-    if legacyProviderRegistration
-      legacyProviderRegistration.service.dispose()
-      legacyProviderRegistration.selectors.push(selector) if legacyProviderRegistration.selectors.indexOf(selector) < 0
-
-    else
-      legacyProviderRegistration = {selectors: [selector]}
-      @legacyProviderRegistrations.set(legacyProvider.constructor, legacyProviderRegistration)
-
-    selector = legacyProviderRegistration.selectors.join(',')
-
-    legacyProviderRegistration.shim = @shimLegacyProvider(legacyProvider, selector)
-    legacyProviderRegistration.service = @registerProvider(legacyProviderRegistration.shim)
-    return legacyProviderRegistration.service
-
-  shimLegacyProvider: (legacyProvider, selector) ->
-    shim =
-      legacyProvider: legacyProvider
-      requestHandler: legacyProvider.buildSuggestionsShim
-      selector: selector
-      dispose: ->
-        requestHandler = null
-        legacyProvider.dispose() if legacyProvider.dispose?
-        legacyProvider = null
-        selector = null
-    shim
-
-  unregisterLegacyProvider: (legacyProvider) =>
-    return unless legacyProvider?
-    legacyProviderRegistration = @legacyProviderRegistrations.get(legacyProvider.constructor)
-    if legacyProviderRegistration
-      legacyProviderRegistration.service.dispose()
-      @legacyProviderRegistrations.delete(legacyProvider.constructor)
diff --git a/lib/provider.coffee b/lib/provider.coffee
deleted file mode 100644
index 31bceea6..00000000
--- a/lib/provider.coffee
+++ /dev/null
@@ -1,61 +0,0 @@
-{deprecate} = require('grim')
-
-# Public: A provider provides an interface to the autocomplete package. Third-party
-# packages can register providers which will then be used to generate the
-# suggestions list.
-module.exports =
-class Provider
-  wordRegex: /\b\w*[a-zA-Z_-]+\w*\b/g
-
-  constructor: ->
-    deprecate('`Provider` is no longer supported. Please switch to the new API: https://github.com/atom-community/autocomplete-plus/wiki/Provider-API')
-    @initialize.apply(this, arguments)
-
-  # Public: An initializer for subclasses
-  initialize: ->
-    return
-
-  # Public: Defines whether the words returned at {::buildSuggestions} should be added to
-  # the default suggestions or should be displayed exclusively
-  exclusive: false
-
-  buildSuggestionsShim: (options) =>
-    return unless options?.editor?
-    @editor = options.editor
-    @buildSuggestions.apply(this, arguments)
-
-  # Public: Gets called when the document has been changed. Returns an array with
-  # suggestions. If `exclusive` is set to true and this method returns suggestions,
-  # the suggestions will be the only ones that are displayed.
-  #
-  # Returns An {Array} of suggestions.
-  buildSuggestions: ->
-    throw new Error('Subclass must implement a buildSuggestions(options) method')
-
-  # Public: Gets called when a suggestion has been confirmed by the user. Return true
-  # to replace the word with the suggestion. Return false if you want to handle
-  # the behavior yourself.
-  #
-  # suggestion - The {Suggestion} to confirm
-  #
-  # Returns {Boolean} indicating whether the suggestion should be automatically replaced.
-  confirm: (suggestion) ->
-    return true
-
-  # Public: Finds and returns the content before the current cursor position
-  #
-  # selection - The {Selection} for the current cursor position
-  #
-  # Returns {String} with the prefix of the {Selection}
-  prefixOfSelection: (selection) ->
-    selectionRange = selection.getBufferRange()
-    lineRange = [[selectionRange.start.row, 0], [selectionRange.end.row, @editor.lineTextForBufferRow(selectionRange.end.row).length]]
-    prefix = ''
-    @editor.getBuffer().scanInRange @wordRegex, lineRange, ({match, range, stop}) ->
-      stop() if range.start.isGreaterThan(selectionRange.end)
-
-      if range.intersectsWith(selectionRange)
-        prefixOffset = selectionRange.start.column - range.start.column
-        prefix = match[0][0...prefixOffset] if range.start.isLessThan(selectionRange.start)
-
-    return prefix
diff --git a/lib/suggestion.coffee b/lib/suggestion.coffee
deleted file mode 100644
index 7b18d0f1..00000000
--- a/lib/suggestion.coffee
+++ /dev/null
@@ -1,11 +0,0 @@
-{deprecate} = require('grim')
-module.exports =
-class Suggestion
-  constructor: (@provider, options) ->
-    deprecate('`Suggestion` is no longer supported. Please switch to the new API: https://github.com/atom-community/autocomplete-plus/wiki/Provider-API')
-    @word = options.word if options.word?
-    @prefix = options.prefix if options.prefix?
-    @label = options.label if options.label?
-    @data = options.data if options.data?
-    @renderLabelAsHtml = options.renderLabelAsHtml if options.renderLabelAsHtml?
-    @className = options.className if options.className?
diff --git a/spec/autocomplete-blacklist-spec.coffee b/spec/autocomplete-blacklist-spec.coffee
index dce30ef2..56a9c996 100644
--- a/spec/autocomplete-blacklist-spec.coffee
+++ b/spec/autocomplete-blacklist-spec.coffee
@@ -1,6 +1,5 @@
 {triggerAutocompletion, buildIMECompositionEvent, buildTextInputEvent} = require('./spec-helper')
 _ = require('underscore-plus')
-TestProvider = require('./lib/test-provider')
 
 describe 'Autocomplete', ->
   [completionDelay, editorView, editor, mainModule, autocompleteManager] = []
diff --git a/spec/fuzzy-provider-spec.coffee b/spec/fuzzy-provider-spec.coffee
index f8075473..52862a84 100644
--- a/spec/fuzzy-provider-spec.coffee
+++ b/spec/fuzzy-provider-spec.coffee
@@ -1,6 +1,5 @@
 {triggerAutocompletion, buildIMECompositionEvent, buildTextInputEvent} = require('./spec-helper')
 _ = require('underscore-plus')
-TestProvider = require('./lib/test-provider')
 
 describe 'Autocomplete', ->
   [completionDelay, editorView, editor, mainModule, autocompleteManager] = []
diff --git a/spec/html-label-spec.coffee b/spec/html-label-spec.coffee
index dd3ddb8c..be977379 100644
--- a/spec/html-label-spec.coffee
+++ b/spec/html-label-spec.coffee
@@ -1,5 +1,4 @@
 {waitForAutocomplete} = require('./spec-helper')
-TestProvider = require('./lib/test-provider')
 
 describe 'HTML labels', ->
   [completionDelay, editorView, editor, mainModule, autocompleteManager, registration] = []
diff --git a/spec/issues/57-spec.coffee b/spec/issues/57-spec.coffee
index 97f1bace..de35bf2a 100644
--- a/spec/issues/57-spec.coffee
+++ b/spec/issues/57-spec.coffee
@@ -1,5 +1,4 @@
 {waitForAutocomplete, triggerAutocompletion, buildIMECompositionEvent, buildTextInputEvent} = require('../spec-helper')
-TestProvider = require('../lib/test-provider')
 
 describe 'Autocomplete', ->
   [mainModule, autocompleteManager, editorView, editor, completionDelay, mainModule] = []
diff --git a/spec/lib/test-provider.coffee b/spec/lib/test-provider.coffee
deleted file mode 100644
index 35c10412..00000000
--- a/spec/lib/test-provider.coffee
+++ /dev/null
@@ -1,15 +0,0 @@
-{Provider, Suggestion} = require('../../lib/main')
-
-module.exports =
-class TestProvider extends Provider
-  buildSuggestions: ->
-    [new Suggestion(this,
-      word: 'ohai',
-      prefix: 'ohai',
-      label: '<span style=\'color: red\'>ohai</span>',
-      renderLabelAsHtml: true,
-      className: 'ohai'
-    )]
-
-  dispose: ->
-    foo = 'bar'
diff --git a/spec/provider-api-spec.coffee b/spec/provider-api-spec.coffee
index caa24cc1..60172c27 100644
--- a/spec/provider-api-spec.coffee
+++ b/spec/provider-api-spec.coffee
@@ -1,5 +1,4 @@
 {waitForAutocomplete} = require('./spec-helper')
-TestProvider = require('./lib/test-provider')
 _ = require('underscore-plus')
 
 describe 'Provider API', ->
@@ -44,91 +43,6 @@ describe 'Provider API', ->
       waitsForPromise ->
         atom.packages.activatePackage('language-javascript')
 
-    describe 'Legacy Provider API', ->
-      it 'registers the given provider for the given editor', ->
-        runs ->
-          expect(autocompleteManager.providerManager.store).toBeDefined()
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(1)
-
-          testProvider = new TestProvider()
-          expect(autocompleteManager.providerManager.isLegacyProvider(testProvider)).toEqual(true)
-          registration = mainModule.registerProviderForEditor(testProvider, editor)
-
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(2)
-          expect(autocompleteManager.providerManager.legacyProviderRegistrations.has(testProvider.constructor)).toEqual(true)
-          providerRegistration = autocompleteManager.providerManager.legacyProviderRegistrations.get(testProvider.constructor)
-          expect(providerRegistration.selectors).toEqual(['.source.js'])
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), testProvider)).toEqual(false)
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), providerRegistration.shim)).toEqual(true)
-
-      it 'registers the given provider once when called multiple times for the given editor', ->
-        runs ->
-          expect(autocompleteManager.providerManager.store).toBeDefined()
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(1)
-
-          testProvider = new TestProvider()
-          expect(autocompleteManager.providerManager.isLegacyProvider(testProvider)).toEqual(true)
-          registration = mainModule.registerProviderForEditor(testProvider, editor)
-
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(2)
-          expect(autocompleteManager.providerManager.legacyProviderRegistrations.has(testProvider.constructor)).toEqual(true)
-          providerRegistration = autocompleteManager.providerManager.legacyProviderRegistrations.get(testProvider.constructor)
-          expect(providerRegistration.selectors).toEqual(['.source.js'])
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), testProvider)).toEqual(false)
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), providerRegistration.shim)).toEqual(true)
-
-          registration = mainModule.registerProviderForEditor(testProvider, editor)
-
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(2)
-          expect(autocompleteManager.providerManager.legacyProviderRegistrations.has(testProvider.constructor)).toEqual(true)
-          providerRegistration = autocompleteManager.providerManager.legacyProviderRegistrations.get(testProvider.constructor)
-          expect(providerRegistration.selectors).toEqual(['.source.js'])
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), testProvider)).toEqual(false)
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), providerRegistration.shim)).toEqual(true)
-
-          registration = mainModule.registerProviderForEditor(testProvider, editor)
-
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(2)
-          expect(autocompleteManager.providerManager.legacyProviderRegistrations.has(testProvider.constructor)).toEqual(true)
-          providerRegistration = autocompleteManager.providerManager.legacyProviderRegistrations.get(testProvider.constructor)
-          expect(providerRegistration.selectors).toEqual(['.source.js'])
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), testProvider)).toEqual(false)
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), providerRegistration.shim)).toEqual(true)
-
-      it 'unregisters the provider from all editors', ->
-        runs ->
-          expect(autocompleteManager.providerManager.store).toBeDefined()
-          testProvider = new TestProvider()
-          expect(autocompleteManager.providerManager.isLegacyProvider(testProvider)).toEqual(true)
-          registration = mainModule.registerProviderForEditor(testProvider, editor)
-
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(2)
-          expect(autocompleteManager.providerManager.legacyProviderRegistrations.has(testProvider.constructor)).toEqual(true)
-          providerRegistration = autocompleteManager.providerManager.legacyProviderRegistrations.get(testProvider.constructor)
-          expect(providerRegistration.selectors).toEqual(['.source.js'])
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), testProvider)).toEqual(false)
-          expect(_.contains(autocompleteManager.providerManager.providersForScopeChain('.source.js'), providerRegistration.shim)).toEqual(true)
-
-          mainModule.unregisterProvider(testProvider)
-          expect(autocompleteManager.providerManager.store).toBeDefined()
-          expect(_.size(autocompleteManager.providerManager.providersForScopeChain('.source.js'))).toEqual(1)
-          expect(autocompleteManager.providerManager.legacyProviderRegistrations.has(testProvider.constructor)).toEqual(false)
-
-      it 'buildSuggestions is called for a registered provider', ->
-        runs ->
-          testProvider = new TestProvider()
-          mainModule.registerProviderForEditor(testProvider, editor)
-
-          spyOn(testProvider, 'buildSuggestions').andCallThrough()
-
-          # Trigger an autocompletion
-          editor.moveToBottom()
-          editor.moveToBeginningOfLine()
-          editor.insertText('f')
-          advanceClock(completionDelay)
-
-          expect(testProvider.buildSuggestions).toHaveBeenCalled()
-
     describe 'Provider API v1.0.0', ->
       [registration1, registration2, registration3] = []
 
diff --git a/spec/provider-manager-spec.coffee b/spec/provider-manager-spec.coffee
index f8ecc4f9..17d005a1 100644
--- a/spec/provider-manager-spec.coffee
+++ b/spec/provider-manager-spec.coffee
@@ -1,9 +1,8 @@
 ProviderManager = require('../lib/provider-manager')
-TestProvider = require('./lib/test-provider')
 _ = require('underscore-plus')
 
 describe 'Provider Manager', ->
-  [providerManager, testProvider, legacyTestProvider, registration] = []
+  [providerManager, testProvider, registration] = []
 
   beforeEach ->
     runs ->
@@ -19,14 +18,10 @@ describe 'Provider Manager', ->
         dispose: ->
           return
 
-      legacyTestProvider = new TestProvider()
-
   afterEach ->
     runs ->
       registration?.dispose() if registration?.dispose?
       registration = null
-      legacyTestProvider?.dispose() if legacyTestProvider?.dispose?
-      legacyTestProvider = null
       testProvider?.dispose() if testProvider?.dispose?
       testProvider = null
       providerManager?.dispose()
@@ -87,10 +82,6 @@ describe 'Provider Manager', ->
       expect(providerManager.providers.has(testProvider)).toEqual(false)
       expect(_.contains(providerManager.subscriptions?.disposables, testProvider)).toEqual(false)
 
-    it 'can identify a legacy provider', ->
-      expect(providerManager.isLegacyProvider(testProvider)).toEqual(false)
-      expect(providerManager.isLegacyProvider(legacyTestProvider)).toEqual(true)
-
     it 'can identify a provider with a missing requestHandler', ->
       bogusProvider =
         badRequestHandler: (options) ->
@@ -202,20 +193,6 @@ describe 'Provider Manager', ->
       expect(_.contains(providerManager.providersForScopeChain('.source.js'), bogusProvider)).toEqual(false)
       expect(providerManager.providers.has(bogusProvider)).toEqual(false)
 
-    it 'shims a legacy provider during registration', ->
-      expect(_.size(providerManager.providersForScopeChain('.source.js'))).toEqual(1)
-      expect(_.contains(providerManager.providersForScopeChain('.source.js'), providerManager.fuzzyProvider)).toEqual(true)
-      expect(_.contains(providerManager.providersForScopeChain('.source.js'), legacyTestProvider)).toEqual(false)
-      expect(providerManager.providers.has(legacyTestProvider)).toEqual(false)
-
-      expect(providerManager.isLegacyProvider(legacyTestProvider)).toEqual(true)
-      registration = providerManager.registerLegacyProvider(legacyTestProvider, '.source.js')
-      expect(_.size(providerManager.providersForScopeChain('.source.js'))).toEqual(2)
-      expect(providerManager.legacyProviderRegistrations.has(legacyTestProvider.constructor)).toEqual(true)
-      legacyProviderRegistration = providerManager.legacyProviderRegistrations.get(legacyTestProvider.constructor)
-      expect(_.contains(providerManager.providersForScopeChain('.source.js'), legacyTestProvider)).toEqual(false)
-      expect(_.contains(providerManager.providersForScopeChain('.source.js'), legacyProviderRegistration.shim)).toEqual(true)
-
     it 'registers a provider with a blacklist', ->
       testProvider =
         requestHandler: (options) ->
diff --git a/spec/symbol-provider-spec.coffee b/spec/symbol-provider-spec.coffee
index d7ee63cc..f48a9fc4 100644
--- a/spec/symbol-provider-spec.coffee
+++ b/spec/symbol-provider-spec.coffee
@@ -1,7 +1,6 @@
 {Point} = require 'atom'
 {triggerAutocompletion, buildIMECompositionEvent, buildTextInputEvent} = require('./spec-helper')
 _ = require('underscore-plus')
-TestProvider = require('./lib/test-provider')
 
 indexOfWord = (suggestionList, word) ->
   for suggestion, i in suggestionList