diff --git a/.changes/unreleased/Fixes-20231101-155824.yaml b/.changes/unreleased/Fixes-20231101-155824.yaml
new file mode 100644
index 00000000000..dba6679a53e
--- /dev/null
+++ b/.changes/unreleased/Fixes-20231101-155824.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Make relation filtering None-tolerant for maximal flexibility across adapters.
+time: 2023-11-01T15:58:24.552054-04:00
+custom:
+  Author: peterallenwebb
+  Issue: "8974"
diff --git a/core/dbt/adapters/base/impl.py b/core/dbt/adapters/base/impl.py
index e5861cec655..62ac303ca14 100644
--- a/core/dbt/adapters/base/impl.py
+++ b/core/dbt/adapters/base/impl.py
@@ -1179,9 +1179,12 @@ def get_filtered_catalog(
             }
 
             def in_map(row: agate.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()
+                d = _expect_row_value("table_database", row)
+                s = _expect_row_value("table_schema", row)
+                i = _expect_row_value("table_name", row)
+                d = d.casefold() if d is not None else None
+                s = s.casefold() if s is not None else None
+                i = i.casefold() if i is not None else None
                 return (d, s, i) in relation_map
 
             catalogs = catalogs.where(in_map)