diff --git a/.changelog/19535.txt b/.changelog/19535.txt
new file mode 100644
index 00000000000..50c62e684b8
--- /dev/null
+++ b/.changelog/19535.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_ec2_capacity_reservation: Add `outpost_arn` argument
+```
diff --git a/aws/resource_aws_ec2_capacity_reservation.go b/aws/resource_aws_ec2_capacity_reservation.go
index 57e491bebf6..9d20620db3f 100644
--- a/aws/resource_aws_ec2_capacity_reservation.go
+++ b/aws/resource_aws_ec2_capacity_reservation.go
@@ -98,6 +98,11 @@ func resourceAwsEc2CapacityReservation() *schema.Resource {
 				Required: true,
 				ForceNew: true,
 			},
+			"outpost_arn": {
+				Type:         schema.TypeString,
+				Optional:     true,
+				ValidateFunc: validateArn,
+			},
 			"owner_id": {
 				Type:     schema.TypeString,
 				Computed: true,
@@ -156,6 +161,10 @@ func resourceAwsEc2CapacityReservationCreate(d *schema.ResourceData, meta interf
 		opts.InstanceMatchCriteria = aws.String(v.(string))
 	}
 
+	if v, ok := d.GetOk("outpost_arn"); ok {
+		opts.OutpostArn = aws.String(v.(string))
+	}
+
 	if v, ok := d.GetOk("tenancy"); ok {
 		opts.Tenancy = aws.String(v.(string))
 	}
@@ -214,6 +223,7 @@ func resourceAwsEc2CapacityReservationRead(d *schema.ResourceData, meta interfac
 	d.Set("instance_match_criteria", reservation.InstanceMatchCriteria)
 	d.Set("instance_platform", reservation.InstancePlatform)
 	d.Set("instance_type", reservation.InstanceType)
+	d.Set("outpost_arn", reservation.OutpostArn)
 	d.Set("owner_id", reservation.OwnerId)
 
 	tags := keyvaluetags.Ec2KeyValueTags(reservation.Tags).IgnoreAws().IgnoreConfig(ignoreTagsConfig)
diff --git a/aws/resource_aws_ec2_capacity_reservation_test.go b/aws/resource_aws_ec2_capacity_reservation_test.go
index 099a5840796..54b4e7e348d 100644
--- a/aws/resource_aws_ec2_capacity_reservation_test.go
+++ b/aws/resource_aws_ec2_capacity_reservation_test.go
@@ -89,6 +89,7 @@ func TestAccAWSEc2CapacityReservation_basic(t *testing.T) {
 					resource.TestCheckResourceAttr(resourceName, "instance_match_criteria", "open"),
 					resource.TestCheckResourceAttr(resourceName, "instance_platform", "Linux/UNIX"),
 					resource.TestCheckResourceAttr(resourceName, "instance_type", "t2.micro"),
+					resource.TestCheckResourceAttr(resourceName, "outpost_arn", ""),
 					testAccCheckResourceAttrAccountID(resourceName, "owner_id"),
 					resource.TestCheckResourceAttr(resourceName, "tags.%", "0"),
 					resource.TestCheckResourceAttr(resourceName, "tenancy", "default"),
diff --git a/website/docs/r/ec2_capacity_reservation.html.markdown b/website/docs/r/ec2_capacity_reservation.html.markdown
index fa70669e024..3d61d70f24d 100644
--- a/website/docs/r/ec2_capacity_reservation.html.markdown
+++ b/website/docs/r/ec2_capacity_reservation.html.markdown
@@ -34,6 +34,7 @@ The following arguments are supported:
 * `instance_match_criteria` - (Optional) Indicates the type of instance launches that the Capacity Reservation accepts. Specify either `open` or `targeted`.
 * `instance_platform` - (Required) The type of operating system for which to reserve capacity. Valid options are `Linux/UNIX`, `Red Hat Enterprise Linux`, `SUSE Linux`, `Windows`, `Windows with SQL Server`, `Windows with SQL Server Enterprise`, `Windows with SQL Server Standard` or `Windows with SQL Server Web`.
 * `instance_type` - (Required) The instance type for which to reserve capacity.
+* `outpost_arn` - (Optional) The Amazon Resource Name (ARN) of the Outpost on which to create the Capacity Reservation.
 * `tags` - (Optional) A map of tags to assign to the resource. If configured with a provider [`default_tags` configuration block](https://www.terraform.io/docs/providers/aws/index.html#default_tags-configuration-block) present, tags with matching keys will overwrite those defined at the provider-level.
 * `tenancy` - (Optional) Indicates the tenancy of the Capacity Reservation. Specify either `default` or `dedicated`.