diff --git a/moto/autoscaling/models.py b/moto/autoscaling/models.py
index cdbe756877df..4f32bfc66a6d 100644
--- a/moto/autoscaling/models.py
+++ b/moto/autoscaling/models.py
@@ -1494,6 +1494,11 @@ def describe_auto_scaling_groups(
         return groups
 
     def delete_auto_scaling_group(self, group_name: str) -> None:
+        if group_name not in self.autoscaling_groups:
+            raise ValidationError(
+                f"AutoScalingGroup name not found - AutoScalingGroup '{group_name}' not found"
+            )
+
         self.set_desired_capacity(group_name, 0)
         self.autoscaling_groups.pop(group_name, None)
 
diff --git a/tests/test_autoscaling/test_autoscaling_groups.py b/tests/test_autoscaling/test_autoscaling_groups.py
index f70be505406d..fcea2ad9712e 100644
--- a/tests/test_autoscaling/test_autoscaling_groups.py
+++ b/tests/test_autoscaling/test_autoscaling_groups.py
@@ -1,6 +1,8 @@
 from unittest import TestCase
 
 import boto3
+import pytest
+from botocore.exceptions import ClientError
 
 from moto import mock_aws
 from moto.core import DEFAULT_ACCOUNT_ID as ACCOUNT_ID
@@ -87,6 +89,16 @@ def test_autoscaling_group_delete(self):
         groups = self.as_client.describe_auto_scaling_groups()["AutoScalingGroups"]
         assert len(groups) == 0
 
+        with pytest.raises(ClientError) as exc:
+            self.as_client.delete_auto_scaling_group(AutoScalingGroupName="invalid")
+        err = exc.value.response["Error"]
+        assert exc.value.response["ResponseMetadata"]["HTTPStatusCode"] == 400
+        assert err["Code"] == "ValidationError"
+        assert (
+            err["Message"]
+            == "AutoScalingGroup name not found - AutoScalingGroup 'invalid' not found"
+        )
+
     def test_describe_autoscaling_groups__instances(self):
         self._create_group(name="test_asg")