diff --git a/.changelog/17982.txt b/.changelog/17982.txt
new file mode 100644
index 000000000000..1b2c8470faf1
--- /dev/null
+++ b/.changelog/17982.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_rds_cluster_instance: Add `configuring-iam-database-auth` pending state
+```
diff --git a/aws/resource_aws_rds_cluster_instance.go b/aws/resource_aws_rds_cluster_instance.go
index 2e11e6290e50..da8ba953b0c2 100644
--- a/aws/resource_aws_rds_cluster_instance.go
+++ b/aws/resource_aws_rds_cluster_instance.go
@@ -627,6 +627,7 @@ func resourceAwsRDSClusterInstanceDelete(d *schema.ResourceData, meta interface{
 var resourceAwsRdsClusterInstanceCreateUpdatePendingStates = []string{
 	"backing-up",
 	"configuring-enhanced-monitoring",
+	"configuring-iam-database-auth",
 	"configuring-log-exports",
 	"creating",
 	"maintenance",