diff --git a/azurerm/internal/services/network/local_network_gateway_resource.go b/azurerm/internal/services/network/local_network_gateway_resource.go
index 5a9e3bd0446d..a538bc1d6f39 100644
--- a/azurerm/internal/services/network/local_network_gateway_resource.go
+++ b/azurerm/internal/services/network/local_network_gateway_resource.go
@@ -57,7 +57,7 @@ func resourceLocalNetworkGateway() *schema.Resource {
 
 			"address_space": {
 				Type:     schema.TypeList,
-				Required: true,
+				Optional: true,
 				Elem: &schema.Schema{
 					Type: schema.TypeString,
 				},
diff --git a/azurerm/internal/services/network/local_network_gateway_resource_test.go b/azurerm/internal/services/network/local_network_gateway_resource_test.go
index 0aa2faa8a593..7a0f0c905d7f 100644
--- a/azurerm/internal/services/network/local_network_gateway_resource_test.go
+++ b/azurerm/internal/services/network/local_network_gateway_resource_test.go
@@ -181,6 +181,13 @@ func TestAccLocalNetworkGateway_updateAddressSpace(t *testing.T) {
 	r := LocalNetworkGatewayResource{}
 
 	data.ResourceTest(t, r, []resource.TestStep{
+		{
+			Config: r.noneAddressSpace(data),
+			Check: resource.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+			),
+		},
+		data.ImportStep(),
 		{
 			Config: r.multipleAddressSpace(data),
 			Check: resource.ComposeTestCheckFunc(
@@ -369,6 +376,26 @@ resource "azurerm_local_network_gateway" "test" {
 `, data.RandomInteger, data.Locations.Primary, data.RandomInteger)
 }
 
+func (LocalNetworkGatewayResource) noneAddressSpace(data acceptance.TestData) string {
+	return fmt.Sprintf(`
+provider "azurerm" {
+  features {}
+}
+
+resource "azurerm_resource_group" "test" {
+  name     = "acctest-%d"
+  location = "%s"
+}
+
+resource "azurerm_local_network_gateway" "test" {
+  name                = "acctestlng-%d"
+  location            = azurerm_resource_group.test.location
+  resource_group_name = azurerm_resource_group.test.name
+  gateway_address     = "127.0.0.1"
+}
+`, data.RandomInteger, data.Locations.Primary, data.RandomInteger)
+}
+
 func (LocalNetworkGatewayResource) multipleAddressSpace(data acceptance.TestData) string {
 	return fmt.Sprintf(`
 provider "azurerm" {
diff --git a/website/docs/r/local_network_gateway.html.markdown b/website/docs/r/local_network_gateway.html.markdown
index c3a520821c05..0dc1f29b2207 100644
--- a/website/docs/r/local_network_gateway.html.markdown
+++ b/website/docs/r/local_network_gateway.html.markdown
@@ -40,7 +40,7 @@ The following arguments are supported:
 * `location` - (Required) The location/region where the local network gateway is
     created. Changing this forces a new resource to be created.
 
-* `address_space` - (Required) The list of string CIDRs representing the
+* `address_space` - (Optional) The list of string CIDRs representing the
     address spaces the gateway exposes.
 
 * `bgp_settings` - (Optional) A `bgp_settings` block as defined below containing the