diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
index 1c8f7a97dd7fe..7c36e3bc79af7 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
@@ -783,6 +783,7 @@ object View {
         "spark.sql.hive.convertMetastoreParquet",
         "spark.sql.hive.convertMetastoreOrc",
         "spark.sql.hive.convertInsertingPartitionedTable",
+        "spark.sql.hive.convertInsertingUnpartitionedTable",
         "spark.sql.hive.convertMetastoreCtas"
       ).contains(key) || key.startsWith("spark.sql.catalog.")
     }
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala
index d71d0d43683cb..cb5e7e7f42d29 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala
@@ -360,6 +360,7 @@ object ViewHelper extends SQLConfHelper with Logging {
     "spark.sql.hive.convertMetastoreParquet",
     "spark.sql.hive.convertMetastoreOrc",
     "spark.sql.hive.convertInsertingPartitionedTable",
+    "spark.sql.hive.convertInsertingUnpartitionedTable",
     "spark.sql.hive.convertMetastoreCtas",
     SQLConf.ADDITIONAL_REMOTE_REPOSITORIES.key)
 
diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveStrategies.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveStrategies.scala
index 5972a9df78ecc..42e30ac0db934 100644
--- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveStrategies.scala
+++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveStrategies.scala
@@ -194,6 +194,8 @@ object HiveAnalysis extends Rule[LogicalPlan] {
  * - When writing to non-partitioned Hive-serde Parquet/Orc tables
  * - When writing to partitioned Hive-serde Parquet/Orc tables when
  *   `spark.sql.hive.convertInsertingPartitionedTable` is true
+ * - When writing to unpartitioned Hive-serde Parquet/Orc tables when
+ *   `spark.sql.hive.convertInsertingUnpartitionedTable` is true
  * - When writing to directory with Hive-serde
  * - When writing to non-partitioned Hive-serde Parquet/ORC tables using CTAS
  * - When scanning Hive-serde Parquet/ORC tables
@@ -230,7 +232,8 @@ case class RelationConversions(
       case InsertIntoStatement(
           r: HiveTableRelation, partition, cols, query, overwrite, ifPartitionNotExists, byName)
           if query.resolved && DDLUtils.isHiveTable(r.tableMeta) &&
-            (!r.isPartitioned || conf.getConf(HiveUtils.CONVERT_INSERTING_PARTITIONED_TABLE))
+            (r.isPartitioned && conf.getConf(HiveUtils.CONVERT_INSERTING_PARTITIONED_TABLE) ||
+              !r.isPartitioned && conf.getConf(HiveUtils.CONVERT_INSERTING_UNPARTITIONED_TABLE))
             && isConvertible(r) =>
         InsertIntoStatement(metastoreCatalog.convert(r, isWrite = true), partition, cols,
           query, overwrite, ifPartitionNotExists, byName)
diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveUtils.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveUtils.scala
index 68f34bd2beb01..b381b35e5f59a 100644
--- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveUtils.scala
+++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveUtils.scala
@@ -154,6 +154,16 @@ private[spark] object HiveUtils extends Logging {
       .booleanConf
       .createWithDefault(true)
 
+  val CONVERT_INSERTING_UNPARTITIONED_TABLE =
+    buildConf("spark.sql.hive.convertInsertingUnpartitionedTable")
+      .doc("When set to true, and `spark.sql.hive.convertMetastoreParquet` or " +
+        "`spark.sql.hive.convertMetastoreOrc` is true, the built-in ORC/Parquet writer is used" +
+        "to process inserting into unpartitioned ORC/Parquet tables created by using the HiveSQL " +
+        "syntax.")
+      .version("4.0.0")
+      .booleanConf
+      .createWithDefault(true)
+
   val CONVERT_METASTORE_CTAS = buildConf("spark.sql.hive.convertMetastoreCtas")
     .doc("When set to true,  Spark will try to use built-in data source writer " +
       "instead of Hive serde in CTAS. This flag is effective only if " +
diff --git a/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/HiveOrcQuerySuite.scala b/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/HiveOrcQuerySuite.scala
index e52d9b639dc4f..610fc246cd845 100644
--- a/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/HiveOrcQuerySuite.scala
+++ b/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/HiveOrcQuerySuite.scala
@@ -284,6 +284,43 @@ class HiveOrcQuerySuite extends OrcQueryTest with TestHiveSingleton {
     }
   }
 
+  test("SPARK-47850 ORC conversation could be applied for unpartitioned table insertion") {
+    withTempView("single") {
+      val singleRowDF = Seq((0, "foo")).toDF("key", "value")
+      singleRowDF.createOrReplaceTempView("single")
+      Seq("true", "false").foreach { conversion =>
+        withSQLConf(HiveUtils.CONVERT_METASTORE_ORC.key -> "true",
+          HiveUtils.CONVERT_INSERTING_UNPARTITIONED_TABLE.key -> conversion) {
+          withTable("dummy_orc_unpartitioned") {
+            spark.sql(
+              s"""
+                 |CREATE TABLE dummy_orc_unpartitioned(key INT, value STRING)
+                 |STORED AS ORC
+                 """.stripMargin)
+
+            spark.sql(
+              s"""
+                 |INSERT INTO TABLE dummy_orc_unpartitioned
+                 |SELECT key, value FROM single
+                 """.stripMargin)
+
+            val orcUnpartitionedTable = TableIdentifier("dummy_orc_unpartitioned", Some("default"))
+            if (conversion == "true") {
+              // if converted, we refresh the cached relation.
+              assert(getCachedDataSourceTable(orcUnpartitionedTable) === null)
+            } else {
+              // otherwise, not cached.
+              assert(getCachedDataSourceTable(orcUnpartitionedTable) === null)
+            }
+
+            val df = spark.sql("SELECT key, value FROM dummy_orc_unpartitioned WHERE key=0")
+            checkAnswer(df, singleRowDF)
+          }
+        }
+      }
+    }
+  }
+
   test("SPARK-32234 read ORC table with column names all starting with '_col'") {
     Seq("native", "hive").foreach { orcImpl =>
       Seq("false", "true").foreach { vectorized =>