diff --git a/.changelog/5121.txt b/.changelog/5121.txt
new file mode 100644
index 0000000000..fce11059f1
--- /dev/null
+++ b/.changelog/5121.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+sql: added field `collation` to `google_sql_database_instance`
+```
diff --git a/google-beta/resource_gke_hub_feature_membership_test.go b/google-beta/resource_gke_hub_feature_membership_test.go
index 9e1f2ea64d..32fa84c196 100644
--- a/google-beta/resource_gke_hub_feature_membership_test.go
+++ b/google-beta/resource_gke_hub_feature_membership_test.go
@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/GoogleCloudPlatform/declarative-resource-client-library/dcl"
+	dcl "github.com/GoogleCloudPlatform/declarative-resource-client-library/dcl"
 	gkehub "github.com/GoogleCloudPlatform/declarative-resource-client-library/services/google/gkehub/beta"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
diff --git a/google-beta/resource_sql_database_instance.go b/google-beta/resource_sql_database_instance.go
index ca0bb6ae82..aa6cd8f109 100644
--- a/google-beta/resource_sql_database_instance.go
+++ b/google-beta/resource_sql_database_instance.go
@@ -238,6 +238,11 @@ settings.backup_configuration.binary_log_enabled are both set to true.`,
 								},
 							},
 						},
+						"collation": {
+							Type:        schema.TypeString,
+							Optional:    true,
+							Description: `The name of server instance collation.`,
+						},
 						"crash_safe_replication": {
 							Type:        schema.TypeBool,
 							Optional:    true,
@@ -991,6 +996,7 @@ func expandSqlDatabaseInstanceSettings(configured []interface{}, secondGen bool)
 		ForceSendFields:             []string{"StorageAutoResize"},
 		ActivationPolicy:            _settings["activation_policy"].(string),
 		AvailabilityType:            _settings["availability_type"].(string),
+		Collation:                   _settings["collation"].(string),
 		CrashSafeReplicationEnabled: _settings["crash_safe_replication"].(bool),
 		DataDiskSizeGb:              int64(_settings["disk_size"].(int)),
 		DataDiskType:                _settings["disk_type"].(string),
@@ -1396,6 +1402,7 @@ func flattenSettings(settings *sqladmin.Settings) []map[string]interface{} {
 		"activation_policy":           settings.ActivationPolicy,
 		"authorized_gae_applications": settings.AuthorizedGaeApplications,
 		"availability_type":           settings.AvailabilityType,
+		"collation":                   settings.Collation,
 		"crash_safe_replication":      settings.CrashSafeReplicationEnabled,
 		"disk_type":                   settings.DataDiskType,
 		"disk_size":                   settings.DataDiskSizeGb,
diff --git a/google-beta/resource_sql_database_instance_test.go b/google-beta/resource_sql_database_instance_test.go
index 58c0868854..187fc55b70 100644
--- a/google-beta/resource_sql_database_instance_test.go
+++ b/google-beta/resource_sql_database_instance_test.go
@@ -958,6 +958,7 @@ resource "google_sql_database_instance" "instance" {
   deletion_protection = false
   settings {
     tier = "db-custom-1-3840"
+    collation = "Polish_CI_AS"
   }
 }
 `
diff --git a/website/docs/d/sql_database_instance.html.markdown b/website/docs/d/sql_database_instance.html.markdown
index d274141553..2ebbd09531 100644
--- a/website/docs/d/sql_database_instance.html.markdown
+++ b/website/docs/d/sql_database_instance.html.markdown
@@ -63,6 +63,8 @@ The `settings` block contains:
 * `availability_type` - The availability type of the Cloud SQL
 instance, high availability (`REGIONAL`) or single zone (`ZONAL`).
 
+* `collation` - The name of server instance collation.
+
 * `crash_safe_replication` - (Deprecated) This property is only applicable to First Generation instances.
     First Generation instances are now deprecated, see [here](https://cloud.google.com/sql/docs/mysql/upgrade-2nd-gen)
 
diff --git a/website/docs/r/sql_database_instance.html.markdown b/website/docs/r/sql_database_instance.html.markdown
index 806a9967aa..affb79aceb 100644
--- a/website/docs/r/sql_database_instance.html.markdown
+++ b/website/docs/r/sql_database_instance.html.markdown
@@ -262,6 +262,8 @@ instance, high availability (`REGIONAL`) or single zone (`ZONAL`).' For MySQL
 instances, ensure that `settings.backup_configuration.enabled` and
 `settings.backup_configuration.binary_log_enabled` are both set to `true`.
 
+* `collation` - (Optional) The name of server instance collation.
+
 * `crash_safe_replication` - (Optional, Deprecated) This property is only applicable to First Generation instances.
     First Generation instances are now deprecated, see [here](https://cloud.google.com/sql/docs/mysql/upgrade-2nd-gen)
     for information on how to upgrade to Second Generation instances.