diff --git a/storage/bucket.go b/storage/bucket.go
index 602c8512856..f2a59f3b3d1 100644
--- a/storage/bucket.go
+++ b/storage/bucket.go
@@ -337,6 +337,10 @@ type BucketAttrs struct {
 	// Typical values are "multi-region", "region" and "dual-region".
 	// This field is read-only.
 	LocationType string
+
+	// The project number of the project the bucket belongs to.
+	// This field is read-only.
+	ProjectNumber uint64
 }
 
 // BucketPolicyOnly is an alias for UniformBucketLevelAccess.
@@ -597,6 +601,7 @@ func newBucket(b *raw.Bucket) (*BucketAttrs, error) {
 		PublicAccessPrevention:   toPublicAccessPrevention(b.IamConfiguration),
 		Etag:                     b.Etag,
 		LocationType:             b.LocationType,
+		ProjectNumber:            b.ProjectNumber,
 	}, nil
 }
 
diff --git a/storage/bucket_test.go b/storage/bucket_test.go
index 4ff5f5cc5ed..3919853e731 100644
--- a/storage/bucket_test.go
+++ b/storage/bucket_test.go
@@ -642,10 +642,11 @@ func TestNewBucket(t *testing.T) {
 		Acl: []*raw.BucketAccessControl{
 			{Bucket: "name", Role: "READER", Email: "joe@example.com", Entity: "allUsers"},
 		},
-		LocationType: "dual-region",
-		Encryption:   &raw.BucketEncryption{DefaultKmsKeyName: "key"},
-		Logging:      &raw.BucketLogging{LogBucket: "lb", LogObjectPrefix: "p"},
-		Website:      &raw.BucketWebsite{MainPageSuffix: "mps", NotFoundPage: "404"},
+		LocationType:  "dual-region",
+		Encryption:    &raw.BucketEncryption{DefaultKmsKeyName: "key"},
+		Logging:       &raw.BucketLogging{LogBucket: "lb", LogObjectPrefix: "p"},
+		Website:       &raw.BucketWebsite{MainPageSuffix: "mps", NotFoundPage: "404"},
+		ProjectNumber: 123231313,
 	}
 	want := &BucketAttrs{
 		Name:                  "name",
@@ -695,6 +696,7 @@ func TestNewBucket(t *testing.T) {
 		ACL:              []ACLRule{{Entity: "allUsers", Role: RoleReader, Email: "joe@example.com"}},
 		DefaultObjectACL: nil,
 		LocationType:     "dual-region",
+		ProjectNumber:    123231313,
 	}
 	got, err := newBucket(rb)
 	if err != nil {
diff --git a/storage/integration_test.go b/storage/integration_test.go
index f90f15322e3..e608034fb10 100644
--- a/storage/integration_test.go
+++ b/storage/integration_test.go
@@ -265,6 +265,9 @@ func TestIntegration_BucketMethods(t *testing.T) {
 	if attrs.LocationType == "" {
 		t.Error("got an empty LocationType")
 	}
+	if attrs.ProjectNumber == 0 {
+		t.Errorf("got a zero ProjectNumber")
+	}
 	h.mustDeleteBucket(b)
 
 	// Test Create and Delete with attributes.
@@ -331,6 +334,9 @@ func TestIntegration_BucketMethods(t *testing.T) {
 	if attrs.LocationType == "" {
 		t.Error("got an empty LocationType")
 	}
+	if attrs.ProjectNumber == 0 {
+		t.Errorf("got a zero ProjectNumber")
+	}
 	h.mustDeleteBucket(b)
 }