diff --git a/.changelog/34216.txt b/.changelog/34216.txt
new file mode 100644
index 00000000000..65b971f6a6b
--- /dev/null
+++ b/.changelog/34216.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_db_instance: Add `postgres` as a valid `engine` value for blue/green deployments
+```
\ No newline at end of file
diff --git a/internal/service/rds/instance.go b/internal/service/rds/instance.go
index d0a08c19a35..8bd4df28673 100644
--- a/internal/service/rds/instance.go
+++ b/internal/service/rds/instance.go
@@ -2822,6 +2822,7 @@ func dbInstanceValidBlueGreenEngines() []string {
 	return []string{
 		InstanceEngineMariaDB,
 		InstanceEngineMySQL,
+		InstanceEnginePostgres,
 	}
 }