diff --git a/.changelog/9468.txt b/.changelog/9468.txt
new file mode 100644
index 0000000000..dde7284ab4
--- /dev/null
+++ b/.changelog/9468.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+composer: added `database_config.zone` field in `google_composer_environment`
+```
diff --git a/google-beta/services/composer/resource_composer_environment.go b/google-beta/services/composer/resource_composer_environment.go
index 349ae1547e..b6cf8a7362 100644
--- a/google-beta/services/composer/resource_composer_environment.go
+++ b/google-beta/services/composer/resource_composer_environment.go
@@ -571,9 +571,15 @@ func ResourceComposerEnvironment() *schema.Resource {
 								Schema: map[string]*schema.Schema{
 									"machine_type": {
 										Type:        schema.TypeString,
-										Required:    true,
+										Optional:    true,
 										Description: `Optional. Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2, db-n1-standard-4, db-n1-standard-8 or db-n1-standard-16. If not specified, db-n1-standard-2 will be used.`,
 									},
+									"zone": {
+										Type:        schema.TypeString,
+										Optional:    true,
+										ForceNew:    true,
+										Description: `Optional. Cloud SQL database preferred zone.`,
+									},
 								},
 							},
 						},
@@ -1429,6 +1435,7 @@ func flattenComposerEnvironmentConfigDatabaseConfig(databaseCfg *composer.Databa
 
 	transformed := make(map[string]interface{})
 	transformed["machine_type"] = databaseCfg.MachineType
+	transformed["zone"] = databaseCfg.Zone
 
 	return []interface{}{transformed}
 }
@@ -1840,6 +1847,7 @@ func expandComposerEnvironmentConfigDatabaseConfig(v interface{}, d *schema.Reso
 
 	transformed := &composer.DatabaseConfig{}
 	transformed.MachineType = original["machine_type"].(string)
+	transformed.Zone = original["zone"].(string)
 
 	return transformed, nil
 }
diff --git a/google-beta/services/composer/resource_composer_environment_test.go b/google-beta/services/composer/resource_composer_environment_test.go
index 6ad2a4f195..1b1caa7f50 100644
--- a/google-beta/services/composer/resource_composer_environment_test.go
+++ b/google-beta/services/composer/resource_composer_environment_test.go
@@ -1753,6 +1753,9 @@ resource "google_composer_environment" "test" {
 		  memory_gb   = 2.0
 		  count   		= 1
 		}
+      }
+	  database_config {
+          zone = "us-east1-c"
       }
       environment_size = "ENVIRONMENT_SIZE_MEDIUM"
       private_environment_config {
diff --git a/website/docs/r/composer_environment.html.markdown b/website/docs/r/composer_environment.html.markdown
index 907ec29f29..f50f286f42 100644
--- a/website/docs/r/composer_environment.html.markdown
+++ b/website/docs/r/composer_environment.html.markdown
@@ -569,10 +569,14 @@ The `web_server_network_access_control` supports:
 <a name="nested_database_config"></a>The `database_config` block supports:
 
 * `machine_type` -
-  (Required)
-  Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2,
+  (Optional)
+  Optional. Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2,
   db-n1-standard-4, db-n1-standard-8 or db-n1-standard-16.
 
+* `Zone` -
+  (Optional)
+  Preferred Cloud SQL database zone.
+
 <a name="nested_web_server_config"></a>The `web_server_config` block supports:
 
 * `machine_type` -