diff --git a/.changes/unreleased/Fixes-20231013-120628.yaml b/.changes/unreleased/Fixes-20231013-120628.yaml
new file mode 100644
index 000000000..a448944ad
--- /dev/null
+++ b/.changes/unreleased/Fixes-20231013-120628.yaml
@@ -0,0 +1,7 @@
+kind: Fixes
+body: Overwrite existing rows on existing seed tables. For unmanaged databases (no location specified), the current seed command in
+  dbt-spark appends to existing seeded tables instead overwriting.
+time: 2023-10-13T12:06:28.078483-06:00
+custom:
+  Author: mv1742
+  Issue: "112"
diff --git a/dbt/include/spark/macros/materializations/seed.sql b/dbt/include/spark/macros/materializations/seed.sql
index 196479cb0..d239295be 100644
--- a/dbt/include/spark/macros/materializations/seed.sql
+++ b/dbt/include/spark/macros/materializations/seed.sql
@@ -27,7 +27,7 @@
       {% endfor %}
 
       {% set sql %}
-          insert into {{ this.render() }} values
+          insert {% if loop.index0 == 0 -%} overwrite {% else -%} into {% endif -%} {{ this.render() }} values
           {% for row in chunk -%}
               ({%- for col_name in agate_table.column_names -%}
                   {%- set inferred_type = adapter.convert_type(agate_table, loop.index0) -%}