diff --git a/h/migrations/versions/59f42b6a0cd9_add_group_creators_as_owners.py b/h/migrations/versions/59f42b6a0cd9_add_group_creators_as_owners.py
new file mode 100644
index 00000000000..f9902a45cc5
--- /dev/null
+++ b/h/migrations/versions/59f42b6a0cd9_add_group_creators_as_owners.py
@@ -0,0 +1,51 @@
+"""Add existing group creators as owners."""
+
+from alembic import op
+from sqlalchemy import Column, ForeignKey, Integer, MetaData, Table, select, update
+from sqlalchemy.dialects.postgresql import JSONB
+
+metadata = MetaData()
+
+
+user_table = Table("user", metadata, Column("id", Integer, primary_key=True))
+
+
+group_table = Table(
+    "group",
+    metadata,
+    Column("id", Integer, primary_key=True),
+    Column("creator_id", Integer, ForeignKey("user.id")),
+)
+
+
+user_group_table = Table(
+    "user_group",
+    metadata,
+    Column("id", Integer, primary_key=True),
+    Column("user_id", Integer, ForeignKey("user.id")),
+    Column("group_id", Integer, ForeignKey("group.id")),
+    Column("roles", JSONB),
+)
+
+
+revision = "59f42b6a0cd9"
+down_revision = "1975edef158d"
+
+
+def upgrade():
+    op.execute(
+        update(user_group_table)
+        .where(
+            user_group_table.c.id.in_(
+                select(user_group_table.c.id)
+                .where(user_group_table.c.group_id == group_table.c.id)
+                .where(user_group_table.c.user_id == user_table.c.id)
+                .where(user_table.c.id == group_table.c.creator_id)
+            )
+        )
+        .values(roles=["owner"])
+    )
+
+
+def downgrade():
+    pass