diff --git a/openstackclient/tests/unit/volume/v2/test_volume.py b/openstackclient/tests/unit/volume/v2/test_volume.py
index 1667f38cd6..8b424f7124 100644
--- a/openstackclient/tests/unit/volume/v2/test_volume.py
+++ b/openstackclient/tests/unit/volume/v2/test_volume.py
@@ -685,7 +685,7 @@ class TestVolumeDelete(TestVolume):
         arglist = [volumes[0].id]
         verifylist = [
             ("force", False),
-            ("purge", False),
+            ("cascade", False),
             ("volumes", [volumes[0].id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -703,7 +703,7 @@ class TestVolumeDelete(TestVolume):
         arglist = [v.id for v in volumes]
         verifylist = [
             ('force', False),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', arglist),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -723,7 +723,7 @@ class TestVolumeDelete(TestVolume):
         ]
         verifylist = [
             ('force', False),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', arglist),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -755,7 +755,7 @@ class TestVolumeDelete(TestVolume):
         ]
         verifylist = [
             ('force', False),
-            ('purge', True),
+            ('cascade', True),
             ('volumes', [volumes[0].id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -776,7 +776,7 @@ class TestVolumeDelete(TestVolume):
         ]
         verifylist = [
             ('force', True),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', [volumes[0].id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
diff --git a/openstackclient/tests/unit/volume/v3/test_volume.py b/openstackclient/tests/unit/volume/v3/test_volume.py
index 076de3ac3b..28dee4f29b 100644
--- a/openstackclient/tests/unit/volume/v3/test_volume.py
+++ b/openstackclient/tests/unit/volume/v3/test_volume.py
@@ -980,7 +980,7 @@ class TestVolumeDeleteLegacy(volume_fakes.TestVolume):
         arglist = [self.volumes[0].id]
         verifylist = [
             ("force", False),
-            ("purge", False),
+            ("cascade", False),
             ("volumes", [self.volumes[0].id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -996,7 +996,7 @@ class TestVolumeDeleteLegacy(volume_fakes.TestVolume):
         arglist = [v.id for v in self.volumes]
         verifylist = [
             ('force', False),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', arglist),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1014,7 +1014,7 @@ class TestVolumeDeleteLegacy(volume_fakes.TestVolume):
         ]
         verifylist = [
             ('force', False),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', arglist),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1044,7 +1044,26 @@ class TestVolumeDeleteLegacy(volume_fakes.TestVolume):
         ]
         verifylist = [
             ('force', False),
-            ('purge', True),
+            ('cascade', True),
+            ('volumes', [self.volumes[0].id]),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        result = self.cmd.take_action(parsed_args)
+
+        self.volumes_mock.delete.assert_called_once_with(
+            self.volumes[0].id, cascade=True
+        )
+        self.assertIsNone(result)
+
+    def test_volume_delete_with_cascade(self):
+        arglist = [
+            '--cascade',
+            self.volumes[0].id,
+        ]
+        verifylist = [
+            ('force', False),
+            ('cascade', True),
             ('volumes', [self.volumes[0].id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1063,7 +1082,7 @@ class TestVolumeDeleteLegacy(volume_fakes.TestVolume):
         ]
         verifylist = [
             ('force', True),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', [self.volumes[0].id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1095,7 +1114,7 @@ class TestVolumeDelete(volume_fakes.TestVolume):
         verifylist = [
             ("remote", True),
             ("force", False),
-            ("purge", False),
+            ("cascade", False),
             ("volumes", [vol.id]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1115,7 +1134,7 @@ class TestVolumeDelete(volume_fakes.TestVolume):
         verifylist = [
             ('remote', True),
             ('force', False),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', arglist[1:]),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1137,7 +1156,7 @@ class TestVolumeDelete(volume_fakes.TestVolume):
         verifylist = [
             ('remote', True),
             ('force', False),
-            ('purge', True),
+            ('cascade', True),
             ('volumes', [vol.id]),
         ]
 
@@ -1146,7 +1165,7 @@ class TestVolumeDelete(volume_fakes.TestVolume):
             exceptions.CommandError, self.cmd.take_action, parsed_args
         )
         self.assertIn(
-            "The --force and --purge options are not supported with the "
+            "The --force and --cascade options are not supported with the "
             "--remote parameter.",
             str(exc),
         )
@@ -1162,7 +1181,7 @@ class TestVolumeDelete(volume_fakes.TestVolume):
         verifylist = [
             ('remote', True),
             ('force', True),
-            ('purge', False),
+            ('cascade', False),
             ('volumes', [vol.id]),
         ]
 
@@ -1171,7 +1190,7 @@ class TestVolumeDelete(volume_fakes.TestVolume):
             exceptions.CommandError, self.cmd.take_action, parsed_args
         )
         self.assertIn(
-            "The --force and --purge options are not supported with the "
+            "The --force and --cascade options are not supported with the "
             "--remote parameter.",
             str(exc),
         )
diff --git a/openstackclient/volume/v2/volume.py b/openstackclient/volume/v2/volume.py
index 179da19601..eaeef61e5e 100644
--- a/openstackclient/volume/v2/volume.py
+++ b/openstackclient/volume/v2/volume.py
@@ -353,13 +353,20 @@ class DeleteVolume(command.Command):
             ),
         )
         group.add_argument(
-            "--purge",
+            "--cascade",
             action="store_true",
             help=_(
                 "Remove any snapshots along with volume(s) "
                 "(defaults to False)"
             ),
         )
+        group.add_argument(
+            # now called "cascade", accept old arg for compatibility
+            "--purge",
+            action="store_true",
+            help=argparse.SUPPRESS,
+            dest='cascade',
+        )
         return parser
 
     def take_action(self, parsed_args):
@@ -373,7 +380,7 @@ class DeleteVolume(command.Command):
                     volume_client.volumes.force_delete(volume_obj.id)
                 else:
                     volume_client.volumes.delete(
-                        volume_obj.id, cascade=parsed_args.purge
+                        volume_obj.id, cascade=parsed_args.cascade
                     )
             except Exception as e:
                 result += 1
diff --git a/openstackclient/volume/v3/volume.py b/openstackclient/volume/v3/volume.py
index 6f705ad6f9..f46d3702ec 100644
--- a/openstackclient/volume/v3/volume.py
+++ b/openstackclient/volume/v3/volume.py
@@ -372,9 +372,9 @@ class DeleteVolume(volume_v2.DeleteVolume):
         volume_client_sdk = self.app.client_manager.sdk_connection.volume
         result = 0
 
-        if parsed_args.remote and (parsed_args.force or parsed_args.purge):
+        if parsed_args.remote and (parsed_args.force or parsed_args.cascade):
             msg = _(
-                "The --force and --purge options are not "
+                "The --force and --cascade options are not "
                 "supported with the --remote parameter."
             )
             raise exceptions.CommandError(msg)
@@ -388,7 +388,7 @@ class DeleteVolume(volume_v2.DeleteVolume):
                     volume_client.volumes.force_delete(volume_obj.id)
                 else:
                     volume_client.volumes.delete(
-                        volume_obj.id, cascade=parsed_args.purge
+                        volume_obj.id, cascade=parsed_args.cascade
                     )
             except Exception as e:
                 result += 1