diff --git a/.changelog/20711.txt b/.changelog/20711.txt
new file mode 100644
index 00000000000..e0065817019
--- /dev/null
+++ b/.changelog/20711.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_sagemaker_notebook_instance: Add `platform_identifier` argument
+```
\ No newline at end of file
diff --git a/aws/resource_aws_sagemaker_notebook_instance.go b/aws/resource_aws_sagemaker_notebook_instance.go
index 7e829d9a809..bfd10409c12 100644
--- a/aws/resource_aws_sagemaker_notebook_instance.go
+++ b/aws/resource_aws_sagemaker_notebook_instance.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"regexp"
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
@@ -56,6 +57,15 @@ func resourceAwsSagemakerNotebookInstance() *schema.Resource {
 				Required:     true,
 				ValidateFunc: validation.StringInSlice(sagemaker.InstanceType_Values(), false),
 			},
+
+			"platform_identifier": {
+				Type:         schema.TypeString,
+				Optional:     true,
+				Computed:     true,
+				ForceNew:     true,
+				ValidateFunc: validation.StringMatch(regexp.MustCompile(`^(notebook-al1-v1|notebook-al2-v1)$`), ""),
+			},
+
 			"additional_code_repositories": {
 				Type:     schema.TypeSet,
 				Optional: true,
@@ -147,6 +157,10 @@ func resourceAwsSagemakerNotebookInstanceCreate(d *schema.ResourceData, meta int
 		createOpts.RootAccess = aws.String(v.(string))
 	}
 
+	if v, ok := d.GetOk("platform_identifier"); ok {
+		createOpts.PlatformIdentifier = aws.String(v.(string))
+	}
+
 	if v, ok := d.GetOk("direct_internet_access"); ok {
 		createOpts.DirectInternetAccess = aws.String(v.(string))
 	}
@@ -226,6 +240,11 @@ func resourceAwsSagemakerNotebookInstanceRead(d *schema.ResourceData, meta inter
 	if err := d.Set("instance_type", notebookInstance.InstanceType); err != nil {
 		return fmt.Errorf("error setting instance_type for sagemaker notebook instance (%s): %s", d.Id(), err)
 	}
+
+	if err := d.Set("platform_identifier", notebookInstance.PlatformIdentifier); err != nil {
+		return fmt.Errorf("error setting platform_identifier for sagemaker notebook instance (%s): %s", d.Id(), err)
+	}
+
 	if err := d.Set("subnet_id", notebookInstance.SubnetId); err != nil {
 		return fmt.Errorf("error setting subnet_id for sagemaker notebook instance (%s): %s", d.Id(), err)
 	}
diff --git a/aws/resource_aws_sagemaker_notebook_instance_test.go b/aws/resource_aws_sagemaker_notebook_instance_test.go
index 6fc80c9c4cf..f2caf1789d4 100644
--- a/aws/resource_aws_sagemaker_notebook_instance_test.go
+++ b/aws/resource_aws_sagemaker_notebook_instance_test.go
@@ -92,6 +92,7 @@ func TestAccAWSSagemakerNotebookInstance_basic(t *testing.T) {
 					testAccCheckAWSSagemakerNotebookInstanceExists(resourceName, &notebook),
 					resource.TestCheckResourceAttr(resourceName, "name", rName),
 					resource.TestCheckResourceAttr(resourceName, "instance_type", "ml.t2.medium"),
+					resource.TestCheckResourceAttr(resourceName, "platform_identifier", "notebook-al1-v1"),
 					resource.TestCheckResourceAttrPair(resourceName, "role_arn", "aws_iam_role.test", "arn"),
 					resource.TestCheckResourceAttr(resourceName, "direct_internet_access", "Enabled"),
 					resource.TestCheckResourceAttr(resourceName, "root_access", "Enabled"),
@@ -435,6 +436,40 @@ func TestAccAWSSagemakerNotebookInstance_root_access(t *testing.T) {
 	})
 }
 
+func TestAccAWSSagemakerNotebookInstance_platform_identifier(t *testing.T) {
+	var notebook sagemaker.DescribeNotebookInstanceOutput
+	rName := acctest.RandomWithPrefix("tf-acc-test")
+	resourceName := "aws_sagemaker_notebook_instance.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		ErrorCheck:   testAccErrorCheck(t, sagemaker.EndpointsID),
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckAWSSagemakerNotebookInstanceDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAWSSagemakerNotebookInstanceConfigPlatformIdentifier(rName, "notebook-al2-v1"),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSSagemakerNotebookInstanceExists(resourceName, &notebook),
+					resource.TestCheckResourceAttr(resourceName, "platform_identifier", "notebook-al2-v1"),
+				),
+			},
+			{
+				ResourceName:      resourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+			{
+				Config: testAccAWSSagemakerNotebookInstanceConfigPlatformIdentifier(rName, "notebook-al1-v1"),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSSagemakerNotebookInstanceExists(resourceName, &notebook),
+					resource.TestCheckResourceAttr(resourceName, "platform_identifier", "notebook-al1-v1"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAWSSagemakerNotebookInstance_direct_internet_access(t *testing.T) {
 	var notebook sagemaker.DescribeNotebookInstanceOutput
 	rName := acctest.RandomWithPrefix("tf-acc-test")
@@ -701,6 +736,16 @@ resource "aws_sagemaker_notebook_instance" "test" {
 `, rName, rootAccess)
 }
 
+func testAccAWSSagemakerNotebookInstanceConfigPlatformIdentifier(rName string, platformIdentifier string) string {
+	return testAccAWSSagemakerNotebookInstanceBaseConfig(rName) + fmt.Sprintf(`
+resource "aws_sagemaker_notebook_instance" "test" {
+  name                = %[1]q
+  role_arn            = aws_iam_role.test.arn
+  instance_type       = "ml.t2.medium"
+  platform_identifier = %[2]q
+}
+`, rName, platformIdentifier)
+}
 func testAccAWSSagemakerNotebookInstanceConfigDirectInternetAccess(rName string, directInternetAccess string) string {
 	return testAccAWSSagemakerNotebookInstanceBaseConfig(rName) +
 		fmt.Sprintf(`
diff --git a/website/docs/r/sagemaker_notebook_instance.html.markdown b/website/docs/r/sagemaker_notebook_instance.html.markdown
index e2157d38953..8a819c753d7 100644
--- a/website/docs/r/sagemaker_notebook_instance.html.markdown
+++ b/website/docs/r/sagemaker_notebook_instance.html.markdown
@@ -56,6 +56,7 @@ The following arguments are supported:
 * `name` - (Required) The name of the notebook instance (must be unique).
 * `role_arn` - (Required) The ARN of the IAM role to be used by the notebook instance which allows SageMaker to call other services on your behalf.
 * `instance_type` - (Required) The name of ML compute instance type.
+* `platform_identifier` - (Optional) The platform identifier of the notebook instance runtime environment. This value can be either `notebook-al1-v1` or `notebook-al2-v1`, depending on which version of Amazon Linux you require.
 * `volume_size` - (Optional) The size, in GB, of the ML storage volume to attach to the notebook instance. The default value is 5 GB.
 * `subnet_id` - (Optional) The VPC subnet ID.
 * `security_groups` - (Optional) The associated security groups.