diff --git a/azurerm/internal/services/domainservices/active_directory_domain_service_data_source.go b/azurerm/internal/services/domainservices/active_directory_domain_service_data_source.go
index 6eff7e2dc0a3..b7e977f27287 100644
--- a/azurerm/internal/services/domainservices/active_directory_domain_service_data_source.go
+++ b/azurerm/internal/services/domainservices/active_directory_domain_service_data_source.go
@@ -86,55 +86,6 @@ func dataSourceActiveDirectoryDomainService() *pluginsdk.Resource {
 				},
 			},
 
-			"resource_forest": {
-				Type:     pluginsdk.TypeList,
-				Computed: true,
-				Elem: &pluginsdk.Resource{
-					Schema: map[string]*pluginsdk.Schema{
-						"resource_forest": {
-							Type:     pluginsdk.TypeString,
-							Computed: true,
-						},
-
-						"trust": {
-							Type:     pluginsdk.TypeList,
-							Computed: true,
-							Elem: &pluginsdk.Resource{
-								Schema: map[string]*pluginsdk.Schema{
-									"name": {
-										Type:     pluginsdk.TypeString,
-										Computed: true,
-									},
-
-									"remote_dns_ips": {
-										Type:     pluginsdk.TypeList,
-										Computed: true,
-										Elem: &pluginsdk.Schema{
-											Type: pluginsdk.TypeString,
-										},
-									},
-
-									"direction": {
-										Type:     pluginsdk.TypeString,
-										Computed: true,
-									},
-
-									"password": {
-										Type:     pluginsdk.TypeString,
-										Computed: true,
-									},
-
-									"trusted_domain_fqdn": {
-										Type:     pluginsdk.TypeString,
-										Computed: true,
-									},
-								},
-							},
-						},
-					},
-				},
-			},
-
 			"secure_ldap": {
 				Type:     pluginsdk.TypeList,
 				Computed: true,
@@ -316,10 +267,6 @@ func dataSourceActiveDirectoryDomainServiceRead(d *pluginsdk.ResourceData, meta
 			return fmt.Errorf("setting `notifications`: %+v", err)
 		}
 
-		if err := d.Set("resource_forest", flattenDomainServiceResourceForest(props.ResourceForestSettings)); err != nil {
-			return fmt.Errorf("setting `resource_forest`: %+v", err)
-		}
-
 		if err := d.Set("secure_ldap", flattenDomainServiceLdaps(d, props.LdapsSettings, true)); err != nil {
 			return fmt.Errorf("setting `secure_ldap`: %+v", err)
 		}
diff --git a/azurerm/internal/services/domainservices/active_directory_domain_service_resource.go b/azurerm/internal/services/domainservices/active_directory_domain_service_resource.go
index 6874b14f7ffa..7420adc457d6 100644
--- a/azurerm/internal/services/domainservices/active_directory_domain_service_resource.go
+++ b/azurerm/internal/services/domainservices/active_directory_domain_service_resource.go
@@ -739,62 +739,6 @@ func flattenDomainServiceReplicaSets(input *[]aad.ReplicaSet) (ret []interface{}
 	return
 }
 
-func flattenDomainServiceResourceForest(input *aad.ResourceForestSettings) []interface{} {
-	if input == nil {
-		return make([]interface{}, 0)
-	}
-
-	forestTrust := make([]map[string]interface{}, 0)
-	if input.Settings != nil {
-		for _, rf := range *input.Settings {
-			ft := map[string]interface{}{
-				"name":                "",
-				"remote_dns_ips":      make([]string, 0),
-				"direction":           "",
-				"password":            "",
-				"trusted_domain_fqdn": "",
-			}
-
-			if rf.FriendlyName != nil {
-				ft["name"] = *rf.FriendlyName
-			}
-			if rf.RemoteDNSIps != nil {
-				remoteDnsIps := make([]string, 0)
-				r := strings.Split(*rf.RemoteDNSIps, ",")
-				for _, i := range r {
-					remoteDnsIps = append(remoteDnsIps, strings.TrimSpace(i))
-				}
-				ft["remote_dns_ips"] = remoteDnsIps
-			}
-			if rf.TrustDirection != nil {
-				ft["direction"] = *rf.TrustDirection
-			}
-			if rf.TrustPassword != nil {
-				ft["password"] = *rf.TrustPassword
-			}
-			if rf.TrustedDomainFqdn != nil {
-				ft["trusted_domain_fqdn"] = *rf.TrustedDomainFqdn
-			}
-
-			forestTrust = append(forestTrust, ft)
-		}
-	}
-
-	result := map[string]interface{}{
-		"resource_forest": "",
-		"trust":           forestTrust,
-	}
-	if input.ResourceForest != nil {
-		result["resource_forest"] = *input.ResourceForest
-	}
-
-	if result["resource_forest"].(string) == "" && len(result["forest_trust"].([]map[string]interface{})) == 0 {
-		return make([]interface{}, 0)
-	}
-
-	return []interface{}{result}
-}
-
 func flattenDomainServiceSecurity(input *aad.DomainSecuritySettings) []interface{} {
 	if input == nil {
 		return make([]interface{}, 0)
diff --git a/azurerm/internal/services/domainservices/active_directory_domain_service_test.go b/azurerm/internal/services/domainservices/active_directory_domain_service_test.go
index 15a5e6584ed2..747546c35b6a 100644
--- a/azurerm/internal/services/domainservices/active_directory_domain_service_test.go
+++ b/azurerm/internal/services/domainservices/active_directory_domain_service_test.go
@@ -116,7 +116,6 @@ func TestAccActiveDirectoryDomainService_updateWithDatasource(t *testing.T) {
 				check.That(dataSourceData.ResourceName).Key("replica_sets.1.location").Exists(),
 				check.That(dataSourceData.ResourceName).Key("replica_sets.1.service_status").Exists(),
 				check.That(dataSourceData.ResourceName).Key("replica_sets.1.subnet_id").Exists(),
-				check.That(dataSourceData.ResourceName).Key("resource_forest.#").HasValue("0"),
 				check.That(dataSourceData.ResourceName).Key("secure_ldap.#").HasValue("1"),
 				check.That(dataSourceData.ResourceName).Key("secure_ldap.#").HasValue("1"),
 				check.That(dataSourceData.ResourceName).Key("secure_ldap.0.certificate_expiry").Exists(),
diff --git a/website/docs/d/active_directory_domain_service.html.markdown b/website/docs/d/active_directory_domain_service.html.markdown
index ca884ac10565..c1478619605b 100644
--- a/website/docs/d/active_directory_domain_service.html.markdown
+++ b/website/docs/d/active_directory_domain_service.html.markdown
@@ -47,8 +47,6 @@ data "azurerm_active_directory_domain_service" "example" {
   
 * `additional_replica_sets` - Zero or more `replica_set` block as defined below.
 
-* `resource_forest` - A `resource_forest` block as defined below.
-
 * `security` - A `security` block as defined below.
 
 * `sku` - The SKU of the Domain Service resource. One of `Standard`, `Enterprise` or `Premium`.
@@ -95,28 +93,6 @@ A `replica_set` block exports the following:
 
 ---
 
-A `resource_forest` block exports the following:
-
-* `resource_forest` - Resource forest
-
-* `forest_trust` - One or more `forest_trust` blocks as defined below.
-
----
-
-A `forest_trust` block exports the following:
-
-* `name` - A display name to identity the forest trust.
-
-* `remote_dns_ips` - A list of DNS server IP addresses for the trusted forest root domain.
-
-* `trust_direction` - The direction of trust.
-
-* `trust_password` - The password for authenticating the forest trust.
-
-* `trusted_domain_fqdn` - The fully-qualified DNS name for the trusted forest.
-
----
-
 A `security` block exports the following:
 
 * `ntlm_v1_enabled` - Whether legacy NTLM v1 support is enabled.