diff --git a/flint-spark-integration/src/main/scala/org/opensearch/flint/spark/mv/FlintSparkMaterializedView.scala b/flint-spark-integration/src/main/scala/org/opensearch/flint/spark/mv/FlintSparkMaterializedView.scala
index 74626d25d..d7c6ddf81 100644
--- a/flint-spark-integration/src/main/scala/org/opensearch/flint/spark/mv/FlintSparkMaterializedView.scala
+++ b/flint-spark-integration/src/main/scala/org/opensearch/flint/spark/mv/FlintSparkMaterializedView.scala
@@ -196,6 +196,22 @@ object FlintSparkMaterializedView {
       this
     }
 
+    override protected def validateIndex(index: FlintSparkIndex): FlintSparkIndex = {
+      /*
+       * Validate if duplicate column names in the output schema.
+       * MV query may be empty in the case of ALTER index statement.
+       */
+      if (query.nonEmpty) {
+        val outputColNames = flint.spark.sql(query).schema.map(_.name)
+        require(
+          outputColNames.distinct.length == outputColNames.length,
+          "Duplicate columns found in materialized view query output")
+      }
+
+      // Continue to perform any additional index validation
+      super.validateIndex(index)
+    }
+
     override protected def buildIndex(): FlintSparkIndex = {
       // TODO: change here and FlintDS class to support complex field type in future
       val outputSchema = flint.spark
diff --git a/integ-test/src/test/scala/org/opensearch/flint/spark/FlintSparkMaterializedViewSqlITSuite.scala b/integ-test/src/test/scala/org/opensearch/flint/spark/FlintSparkMaterializedViewSqlITSuite.scala
index 8dfde3439..3a17cb8b1 100644
--- a/integ-test/src/test/scala/org/opensearch/flint/spark/FlintSparkMaterializedViewSqlITSuite.scala
+++ b/integ-test/src/test/scala/org/opensearch/flint/spark/FlintSparkMaterializedViewSqlITSuite.scala
@@ -16,7 +16,7 @@ import org.json4s.native.Serialization
 import org.opensearch.flint.core.FlintOptions
 import org.opensearch.flint.core.storage.FlintOpenSearchClient
 import org.opensearch.flint.spark.mv.FlintSparkMaterializedView.getFlintIndexName
-import org.scalatest.matchers.must.Matchers.defined
+import org.scalatest.matchers.must.Matchers.{defined, have}
 import org.scalatest.matchers.should.Matchers.{convertToAnyShouldWrapper, the}
 
 import org.apache.spark.sql.Row
@@ -251,6 +251,26 @@ class FlintSparkMaterializedViewSqlITSuite extends FlintSparkSuite {
     metadata.indexedColumns.map(_.asScala("columnName")) shouldBe Seq("start.time", "count")
   }
 
+  Seq(
+    s"SELECT name, name FROM $testTable",
+    s"SELECT name AS dup_col, age AS dup_col FROM $testTable")
+    .foreach { query =>
+      test(s"should fail to create materialized view if duplicate columns in $query") {
+        the[IllegalArgumentException] thrownBy {
+          withTempDir { checkpointDir =>
+            sql(s"""
+               | CREATE MATERIALIZED VIEW $testMvName
+               | AS $query
+               | WITH (
+               |   auto_refresh = true,
+               |   checkpoint_location = '${checkpointDir.getAbsolutePath}'
+               | )
+               |""".stripMargin)
+          }
+        } should have message "requirement failed: Duplicate columns found in materialized view query output"
+      }
+    }
+
   test("show all materialized views in catalog and database") {
     // Show in catalog
     flint.materializedView().name("spark_catalog.default.mv1").query(testQuery).create()