diff --git a/.changelog/35231.txt b/.changelog/35231.txt
new file mode 100644
index 00000000000..5f9c379e6c3
--- /dev/null
+++ b/.changelog/35231.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_ecr_lifecycle_policy: Add missing `tagPatternList` change detection in policy JSON
+```
\ No newline at end of file
diff --git a/internal/service/ecr/lifecycle_policy.go b/internal/service/ecr/lifecycle_policy.go
index 9e9c9e9c44a..0fc3e7e5681 100644
--- a/internal/service/ecr/lifecycle_policy.go
+++ b/internal/service/ecr/lifecycle_policy.go
@@ -188,11 +188,12 @@ func resourceLifecyclePolicyDelete(ctx context.Context, d *schema.ResourceData,
 }
 
 type lifecyclePolicyRuleSelection struct {
-	TagStatus     *string   `locationName:"tagStatus" type:"string" enum:"tagStatus" required:"true"`
-	TagPrefixList []*string `locationName:"tagPrefixList" type:"list"`
-	CountType     *string   `locationName:"countType" type:"string" enum:"countType" required:"true"`
-	CountUnit     *string   `locationName:"countUnit" type:"string" enum:"countType"`
-	CountNumber   *int64    `locationName:"countNumber" min:"1" type:"integer"`
+	TagStatus      *string   `locationName:"tagStatus" type:"string" enum:"tagStatus" required:"true"`
+	TagPatternList []*string `locationName:"tagPatternList" type:"list"`
+	TagPrefixList  []*string `locationName:"tagPrefixList" type:"list"`
+	CountType      *string   `locationName:"countType" type:"string" enum:"countType" required:"true"`
+	CountUnit      *string   `locationName:"countUnit" type:"string" enum:"countType"`
+	CountNumber    *int64    `locationName:"countNumber" min:"1" type:"integer"`
 }
 
 type lifecyclePolicyRuleAction struct {
@@ -221,6 +222,14 @@ func (lp *lifecyclePolicy) reduce() {
 }
 
 func (lprs *lifecyclePolicyRuleSelection) reduce() {
+	sort.Slice(lprs.TagPatternList, func(i, j int) bool {
+		return aws.StringValue(lprs.TagPatternList[i]) < aws.StringValue(lprs.TagPatternList[j])
+	})
+
+	if len(lprs.TagPatternList) == 0 {
+		lprs.TagPatternList = nil
+	}
+
 	sort.Slice(lprs.TagPrefixList, func(i, j int) bool {
 		return aws.StringValue(lprs.TagPrefixList[i]) < aws.StringValue(lprs.TagPrefixList[j])
 	})
diff --git a/internal/service/ecr/lifecycle_policy_test.go b/internal/service/ecr/lifecycle_policy_test.go
index 5b3bacc0f31..e13dfcb93f2 100644
--- a/internal/service/ecr/lifecycle_policy_test.go
+++ b/internal/service/ecr/lifecycle_policy_test.go
@@ -143,6 +143,32 @@ func testAccCheckLifecyclePolicyExists(ctx context.Context, name string) resourc
 	}
 }
 
+func TestAccECRLifecyclePolicy_detectTagPatternListDiff(t *testing.T) {
+	ctx := acctest.Context(t)
+	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
+	resourceName := "aws_ecr_lifecycle_policy.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.PreCheck(ctx, t) },
+		ErrorCheck:               acctest.ErrorCheck(t, ecr.EndpointsID),
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories,
+		CheckDestroy:             testAccCheckLifecyclePolicyDestroy(ctx),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccLifecyclePolicyConfig_tagPatternList(rName),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckLifecyclePolicyExists(ctx, resourceName),
+				),
+			},
+			{
+				Config:             testAccLifecyclePolicyConfig_tagPatternListChanged(rName),
+				ExpectNonEmptyPlan: true,
+				PlanOnly:           true,
+			},
+		},
+	})
+}
+
 func testAccLifecyclePolicyConfig_basic(rName string) string {
 	return fmt.Sprintf(`
 resource "aws_ecr_repository" "test" {
@@ -302,3 +328,69 @@ resource "aws_ecr_lifecycle_policy" "test" {
 }
 `, rName)
 }
+
+func testAccLifecyclePolicyConfig_tagPatternList(rName string) string {
+	return fmt.Sprintf(`
+resource "aws_ecr_repository" "test" {
+  name = "%s"
+}
+
+resource "aws_ecr_lifecycle_policy" "test" {
+  repository = aws_ecr_repository.test.name
+
+  policy = jsonencode({
+    rules = [
+      {
+        rulePriority = 1
+        description  = "Expire tagged images older than 14 days"
+        selection = {
+          tagStatus = "tagged"
+          tagPatternList = [
+            "alpha-*"
+          ]
+          countType   = "sinceImagePushed"
+          countUnit   = "days"
+          countNumber = 14
+        }
+        action = {
+          type = "expire"
+        }
+      }
+    ]
+  })
+}
+`, rName)
+}
+
+func testAccLifecyclePolicyConfig_tagPatternListChanged(rName string) string {
+	return fmt.Sprintf(`
+resource "aws_ecr_repository" "test" {
+  name = "%s"
+}
+
+resource "aws_ecr_lifecycle_policy" "test" {
+  repository = aws_ecr_repository.test.name
+
+  policy = jsonencode({
+    rules = [
+      {
+        rulePriority = 1
+        description  = "Expire tagged images older than 14 days"
+        selection = {
+          tagStatus = "tagged"
+          tagPatternList = [
+            "beta-*"
+          ]
+          countType   = "sinceImagePushed"
+          countUnit   = "days"
+          countNumber = 14
+        }
+        action = {
+          type = "expire"
+        }
+      }
+    ]
+  })
+}
+`, rName)
+}