diff --git a/app/etc/di.xml b/app/etc/di.xml
index d4651499e6fce..d8908814960f6 100644
--- a/app/etc/di.xml
+++ b/app/etc/di.xml
@@ -1555,6 +1555,7 @@
                 <item name="modify_column" xsi:type="object">Magento\Framework\Setup\Declaration\Schema\Operations\ModifyColumn</item>
                 <item name="add_column" xsi:type="object">Magento\Framework\Setup\Declaration\Schema\Operations\AddColumn</item>
                 <item name="drop_element" xsi:type="object">Magento\Framework\Setup\Declaration\Schema\Operations\DropElement</item>
+                <item name="drop_index" xsi:type="object">Magento\Framework\Setup\Declaration\Schema\Operations\DropIndex</item>
                 <item name="add_complex_element" xsi:type="object">Magento\Framework\Setup\Declaration\Schema\Operations\AddComplexElement</item>
                 <item name="modify_table" xsi:type="object">Magento\Framework\Setup\Declaration\Schema\Operations\ModifyTable</item>
             </argument>
diff --git a/lib/internal/Magento/Framework/Setup/Declaration/Schema/Diff/DiffManager.php b/lib/internal/Magento/Framework/Setup/Declaration/Schema/Diff/DiffManager.php
index af1a35542603e..4b65d9b27bc38 100644
--- a/lib/internal/Magento/Framework/Setup/Declaration/Schema/Diff/DiffManager.php
+++ b/lib/internal/Magento/Framework/Setup/Declaration/Schema/Diff/DiffManager.php
@@ -10,11 +10,13 @@
 use Magento\Framework\Setup\Declaration\Schema\Dto\Column;
 use Magento\Framework\Setup\Declaration\Schema\Dto\Constraints\Reference;
 use Magento\Framework\Setup\Declaration\Schema\Dto\ElementInterface;
+use Magento\Framework\Setup\Declaration\Schema\Dto\Index;
 use Magento\Framework\Setup\Declaration\Schema\Dto\Table;
 use Magento\Framework\Setup\Declaration\Schema\Operations\AddColumn;
 use Magento\Framework\Setup\Declaration\Schema\Operations\AddComplexElement;
 use Magento\Framework\Setup\Declaration\Schema\Operations\CreateTable;
 use Magento\Framework\Setup\Declaration\Schema\Operations\DropElement;
+use Magento\Framework\Setup\Declaration\Schema\Operations\DropIndex;
 use Magento\Framework\Setup\Declaration\Schema\Operations\DropReference;
 use Magento\Framework\Setup\Declaration\Schema\Operations\DropTable;
 use Magento\Framework\Setup\Declaration\Schema\Operations\ModifyColumn;
@@ -107,6 +109,8 @@ public function registerRemoval(
                 $diff->register($generatedElement, DropReference::OPERATION_NAME, $generatedElement);
             } elseif ($generatedElement instanceof Table) {
                 $diff->register($generatedElement, DropTable::OPERATION_NAME, $generatedElement);
+            } elseif ($generatedElement instanceof Index) {
+                $diff->register($generatedElement, DropIndex::OPERATION_NAME, $generatedElement);
             } else {
                 $diff->register($generatedElement, DropElement::OPERATION_NAME, $generatedElement);
             }
diff --git a/lib/internal/Magento/Framework/Setup/Declaration/Schema/Operations/DropIndex.php b/lib/internal/Magento/Framework/Setup/Declaration/Schema/Operations/DropIndex.php
new file mode 100644
index 0000000000000..37488378b3f82
--- /dev/null
+++ b/lib/internal/Magento/Framework/Setup/Declaration/Schema/Operations/DropIndex.php
@@ -0,0 +1,79 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Framework\Setup\Declaration\Schema\Operations;
+
+use Magento\Framework\Setup\Declaration\Schema\Db\AdapterMediator;
+use Magento\Framework\Setup\Declaration\Schema\Db\DbSchemaWriterInterface;
+use Magento\Framework\Setup\Declaration\Schema\Dto\ElementInterface;
+use Magento\Framework\Setup\Declaration\Schema\Dto\TableElementInterface;
+use Magento\Framework\Setup\Declaration\Schema\ElementHistory;
+use Magento\Framework\Setup\Declaration\Schema\OperationInterface;
+
+/**
+ * Drop index operation.
+ *
+ * Drops index.
+ */
+class DropIndex implements OperationInterface
+{
+    /**
+     * Operation name.
+     */
+    public const OPERATION_NAME = 'drop_index';
+
+    /**
+     * @var DbSchemaWriterInterface
+     */
+    private $dbSchemaWriter;
+
+    /**
+     * Constructor.
+     *
+     * @param DbSchemaWriterInterface $dbSchemaWriter
+     */
+    public function __construct(
+        DbSchemaWriterInterface $dbSchemaWriter
+    ) {
+        $this->dbSchemaWriter = $dbSchemaWriter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getOperationName()
+    {
+        return self::OPERATION_NAME;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isOperationDestructive()
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function doOperation(ElementHistory $elementHistory)
+    {
+        /**
+         * @var TableElementInterface | ElementInterface $element
+         */
+        $element = $elementHistory->getNew();
+
+        return [
+            $this->dbSchemaWriter->dropElement(
+                $element->getTable()->getResource(),
+                $element->getName(),
+                $element->getTable()->getName(),
+                $element->getType()
+            )
+        ];
+    }
+}
diff --git a/lib/internal/Magento/Framework/Setup/Test/Unit/Declaration/Schema/Diff/DiffManagerTest.php b/lib/internal/Magento/Framework/Setup/Test/Unit/Declaration/Schema/Diff/DiffManagerTest.php
index 016aff1bfe7c8..edd1e2b071384 100644
--- a/lib/internal/Magento/Framework/Setup/Test/Unit/Declaration/Schema/Diff/DiffManagerTest.php
+++ b/lib/internal/Magento/Framework/Setup/Test/Unit/Declaration/Schema/Diff/DiffManagerTest.php
@@ -116,7 +116,7 @@ public function testRegisterIndexModification()
         $generatedIndex = new Index('index_type', 'index', $table, [$column], 'hash', 'index_type');
         $diff->expects(self::exactly(2))
             ->method('register')
-            ->withConsecutive([$generatedIndex, 'drop_element', $generatedIndex], [$index, 'add_complex_element']);
+            ->withConsecutive([$generatedIndex, 'drop_index', $generatedIndex], [$index, 'add_complex_element']);
         $this->model->registerModification($diff, $index, $generatedIndex);
     }