diff --git a/mira/metamodel/schema.json b/mira/metamodel/schema.json
index d1f3e947..14cfdcd2 100644
--- a/mira/metamodel/schema.json
+++ b/mira/metamodel/schema.json
@@ -819,6 +819,66 @@
         "subject"
       ]
     },
+    "GroupedNaturalConversion": {
+      "title": "GroupedNaturalConversion",
+      "description": "Specifies a process of multiple subjects and outcomes.",
+      "type": "object",
+      "properties": {
+        "rate_law": {
+          "title": "Rate Law",
+          "description": "The rate law for the template.",
+          "type": "string",
+          "example": "2*x"
+        },
+        "name": {
+          "title": "Name",
+          "description": "The name of the template.",
+          "type": "string"
+        },
+        "display_name": {
+          "title": "Display Name",
+          "description": "The display name of the template.",
+          "type": "string"
+        },
+        "type": {
+          "title": "Type",
+          "default": "GroupedNaturalConversion",
+          "const": "GroupedNaturalConversion",
+          "enum": [
+            "GroupedNaturalConversion"
+          ],
+          "type": "string"
+        },
+        "subjects": {
+          "title": "Subjects",
+          "description": "The subject of the conversion.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/Concept"
+          }
+        },
+        "outcomes": {
+          "title": "Outcomes",
+          "description": "The outcome of the conversion.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/Concept"
+          }
+        },
+        "provenance": {
+          "title": "Provenance",
+          "description": "The provenance of the production.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/Provenance"
+          }
+        }
+      },
+      "required": [
+        "subjects",
+        "outcomes"
+      ]
+    },
     "Distribution": {
       "title": "Distribution",
       "description": "A distribution of values for a parameter.",
diff --git a/mira/metamodel/templates.py b/mira/metamodel/templates.py
index c6a22ca9..9db4d2d5 100644
--- a/mira/metamodel/templates.py
+++ b/mira/metamodel/templates.py
@@ -16,6 +16,7 @@
     "GroupedControlledConversion",
     "GroupedControlledProduction",
     "GroupedControlledDegradation",
+    "GroupedNaturalConversion",
     "NaturalReplication",
     "ControlledReplication",
     "StaticConcept",
@@ -1933,3 +1934,52 @@ def conversion_to_deg_prod(conv_template):
                                                         [conv_template.subject],
                                             rate_law=conv_template.rate_law)
     return deepcopy([tdeg, tprod])
+
+
+
+class GroupedNaturalConversion(Template):
+    """Specifies a process of multiple subjects and outcomes."""
+
+    type: Literal["GroupedNaturalConversion"] = Field("GroupedNaturalConversion", const=True)
+    subjects: List[Concept] = Field(..., description="The subject of the conversion.")
+    outcomes: List[Concept] = Field(..., description="The outcome of the conversion.")
+    provenance: List[Provenance] = Field(default_factory=list, description="The provenance of the production.")
+
+    concept_keys: ClassVar[List[str]] = ["subjects", "outcomes"]
+
+
+    def get_key(self, config: Optional[Config] = None):
+        return (
+            self.type,
+            *tuple(
+                c.get_key(config=config)
+                for c in sorted(self.subjects, key=lambda c: c.get_key(config=config))
+            ),
+            *tuple(
+                c.get_key(config=config)
+                for c in sorted(self.outcomes, key=lambda c: c.get_key(config=config))
+            ),
+        )
+
+    def get_concepts(self):
+        return self.subjects + self.outcomes
+
+    def with_context(
+        self,
+        do_rename=False,
+        exclude_concepts=None,
+        curie_to_name_map=None,
+        **context
+    ) -> "GroupedNaturalConversion":
+        exclude_concepts = exclude_concepts or set()
+        return self.__class__(
+            type=self.type,
+            subjects=[c.with_context(do_rename, curie_to_name_map=curie_to_name_map, **context)
+                         if c.name not in exclude_concepts else c
+                         for c in self.subjects],
+            outcomes=[c.with_context(do_rename, curie_to_name_map=curie_to_name_map, **context)
+                         if c.name not in exclude_concepts else c
+                         for c in self.outcomes],        
+            provenance=self.provenance,
+            rate_law=self.rate_law,
+        )
\ No newline at end of file
diff --git a/tests/test_metamodel.py b/tests/test_metamodel.py
index f3393ade..311c768f 100644
--- a/tests/test_metamodel.py
+++ b/tests/test_metamodel.py
@@ -75,6 +75,12 @@ def test_group_controlled(self):
         self.assertIn(self.infected, t1.controllers)
         self.assertIn(self.asymptomatic, t1.controllers)
 
+    def test_grouped_natural_conversion(self):
+        """Test grouped natural conversions."""
+        template = GroupedNaturalConversion(subjects=[self.exposed], outcomes=[self.infected])
+        self.assertEqual([self.infected], template.outcomes)
+        self.assertEqual([self.exposed], template.subjects)
+        
     def test_natural_degradation(self):
         t = NaturalDegradation(subject=self.infected)
         self.assertEqual(self.infected, t.subject)