diff --git a/.changelog/31089.txt b/.changelog/31089.txt
new file mode 100644
index 000000000000..4cbf0e1c8ed2
--- /dev/null
+++ b/.changelog/31089.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+data-source/aws_networkfirewall_firewall_policy: Add `firewall_policy.stateful_rule_group_reference.override` attribute, fixing `setting firewall_policy: Invalid address to set` error
+```
diff --git a/internal/service/networkfirewall/firewall_policy_data_source.go b/internal/service/networkfirewall/firewall_policy_data_source.go
index 1b851ac0a32a..2dec652e28ba 100644
--- a/internal/service/networkfirewall/firewall_policy_data_source.go
+++ b/internal/service/networkfirewall/firewall_policy_data_source.go
@@ -56,6 +56,18 @@ func DataSourceFirewallPolicy() *schema.Resource {
 							Computed: true,
 							Elem: &schema.Resource{
 								Schema: map[string]*schema.Schema{
+									"override": {
+										Type:     schema.TypeList,
+										Optional: true,
+										Elem: &schema.Resource{
+											Schema: map[string]*schema.Schema{
+												"action": {
+													Type:     schema.TypeString,
+													Optional: true,
+												},
+											},
+										},
+									},
 									"priority": {
 										Type:     schema.TypeInt,
 										Computed: true,
diff --git a/internal/service/networkfirewall/firewall_policy_data_source_test.go b/internal/service/networkfirewall/firewall_policy_data_source_test.go
index 7fc7bc0ca301..bc56d4749cf2 100644
--- a/internal/service/networkfirewall/firewall_policy_data_source_test.go
+++ b/internal/service/networkfirewall/firewall_policy_data_source_test.go
@@ -103,6 +103,39 @@ func TestAccNetworkFirewallFirewallPolicyDataSource_nameAndARN(t *testing.T) {
 	})
 }
 
+func TestAccNetworkFirewallFirewallPolicyDataSource_withOverriddenManagedRuleGroup(t *testing.T) {
+	ctx := acctest.Context(t)
+	var firewallPolicy networkfirewall.DescribeFirewallPolicyOutput
+	rName := sdkacctest.RandomWithPrefix("resource-test-terraform")
+	resourceName := "aws_networkfirewall_firewall_policy.test"
+	datasourceName := "data.aws_networkfirewall_firewall_policy.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.PreCheck(ctx, t); testAccPreCheck(ctx, t) },
+		ErrorCheck:               acctest.ErrorCheck(t, networkfirewall.EndpointsID),
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccFirewallPolicyDataSourceConfig_withOverriddenManagedRuleGroup(rName),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					testAccCheckFirewallPolicyExists(ctx, resourceName, &firewallPolicy),
+					resource.TestCheckResourceAttrPair(datasourceName, "arn", resourceName, "arn"), resource.TestCheckResourceAttrPair(datasourceName, "description", resourceName, "description"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.#", resourceName, "firewall_policy.#"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateless_fragment_default_actions.#", resourceName, "firewall_policy.0.stateless_fragment_default_actions.#"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateless_fragment_default_actions.0", resourceName, "firewall_policy.0.stateless_fragment_default_actions.0"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateless_default_actions.#", resourceName, "firewall_policy.0.stateless_default_actions.#"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateless_default_actions.0", resourceName, "firewall_policy.0.stateless_default_actions.0"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateful_rule_group_reference.#", resourceName, "firewall_policy.0.stateful_rule_group_reference.#"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateful_rule_group_reference.0", resourceName, "firewall_policy.0.stateful_rule_group_reference.0"),
+					resource.TestCheckResourceAttrPair(datasourceName, "firewall_policy.0.stateful_rule_group_reference.override.action", resourceName, "firewall_policy.0.stateful_rule_group_reference.override.action"),
+					resource.TestCheckResourceAttrPair(datasourceName, "name", resourceName, "name"),
+					resource.TestCheckResourceAttrPair(datasourceName, "tags.%", resourceName, "tags.%"),
+				),
+			},
+		},
+	})
+}
+
 func testAccFirewallPolicyDataSourceConfig_basic(rName string) string {
 	return fmt.Sprintf(`
 resource "aws_networkfirewall_firewall_policy" "test" {
@@ -142,3 +175,31 @@ data "aws_networkfirewall_firewall_policy" "test" {
   name = aws_networkfirewall_firewall_policy.test.name
 }`)
 }
+
+func testAccFirewallPolicyDataSourceConfig_withOverriddenManagedRuleGroup(rName string) string {
+	return fmt.Sprintf(`
+data "aws_region" "current" {}
+data "aws_partition" "current" {}
+
+resource "aws_networkfirewall_firewall_policy" "test" {
+  name = %[1]q
+
+  firewall_policy {
+    stateless_default_actions          = ["aws:forward_to_sfe"]
+    stateless_fragment_default_actions = ["aws:forward_to_sfe"]
+
+    # Managed rule group required for override block.
+    stateful_rule_group_reference {
+      resource_arn = "arn:${data.aws_partition.current.partition}:network-firewall:${data.aws_region.current.name}:aws-managed:stateful-rulegroup/MalwareDomainsActionOrder"
+
+      override {
+        action = "DROP_TO_ALERT"
+      }
+    }
+  }
+}
+
+data "aws_networkfirewall_firewall_policy" "test" {
+  arn = aws_networkfirewall_firewall_policy.test.arn
+}`, rName)
+}