diff --git a/.changes/unreleased/Features-20240912-153932.yaml b/.changes/unreleased/Features-20240912-153932.yaml
new file mode 100644
index 00000000..8ef2d27d
--- /dev/null
+++ b/.changes/unreleased/Features-20240912-153932.yaml
@@ -0,0 +1,6 @@
+kind: Features
+body: delete+insert requires incremental_predicates if there's no unique_key
+time: 2024-09-12T15:39:32.654501+08:00
+custom:
+    Author: dlord
+    Issue: https://github.com/dbt-labs/dbt-core/issues/10655
diff --git a/dbt/include/global_project/macros/materializations/models/incremental/merge.sql b/dbt/include/global_project/macros/materializations/models/incremental/merge.sql
index ca972c9f..68dcc8f5 100644
--- a/dbt/include/global_project/macros/materializations/models/incremental/merge.sql
+++ b/dbt/include/global_project/macros/materializations/models/incremental/merge.sql
@@ -89,6 +89,18 @@
             {%- endif -%};
 
         {% endif %}
+    {% else %}
+        {% if not incremental_predicates %}
+            {{ exceptions.raise_compiler_error("incremental_predicates is required when there is no unique_key") }}
+        {% endif %}
+
+        delete from {{ target }}
+        where (
+            {% for predicate in incremental_predicates %}
+                {{ predicate|replace('DBT_INTERNAL_DEST', target)|replace('DBT_INTERNAL_SOURCE', source) }}
+                {{ "and " if not loop.last}}
+            {% endfor %}
+        );
     {% endif %}
 
     insert into {{ target }} ({{ dest_cols_csv }})