diff --git a/.changes/unreleased/Fixes-20231030-093734.yaml b/.changes/unreleased/Fixes-20231030-093734.yaml
new file mode 100644
index 00000000000..7322dd5042b
--- /dev/null
+++ b/.changes/unreleased/Fixes-20231030-093734.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix cased comparison in catalog-retrieval function.
+time: 2023-10-30T09:37:34.258612-04:00
+custom:
+  Author: peterallenwebb
+  Issue: "8939"
diff --git a/core/dbt/adapters/base/impl.py b/core/dbt/adapters/base/impl.py
index c7434c2ecb7..e5861cec655 100644
--- a/core/dbt/adapters/base/impl.py
+++ b/core/dbt/adapters/base/impl.py
@@ -1179,9 +1179,9 @@ def get_filtered_catalog(
             }
 
             def in_map(row: agate.Row):
-                d = _expect_row_value("table_database", row)
-                s = _expect_row_value("table_schema", row)
-                i = _expect_row_value("table_name", row)
+                d = _expect_row_value("table_database", row).casefold()
+                s = _expect_row_value("table_schema", row).casefold()
+                i = _expect_row_value("table_name", row).casefold()
                 return (d, s, i) in relation_map
 
             catalogs = catalogs.where(in_map)