diff --git a/jetstream/object.go b/jetstream/object.go
index 32715d788..b0c8a3a53 100644
--- a/jetstream/object.go
+++ b/jetstream/object.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The NATS Authors
+// Copyright 2023-2024 The NATS Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -41,6 +41,10 @@ type (
 		ObjectStore(ctx context.Context, bucket string) (ObjectStore, error)
 		// CreateObjectStore will create an object store.
 		CreateObjectStore(ctx context.Context, cfg ObjectStoreConfig) (ObjectStore, error)
+		// UpdateObjectStore will update an existing object store.
+		UpdateObjectStore(ctx context.Context, cfg ObjectStoreConfig) (ObjectStore, error)
+		// CreateOrUpdateObjectStore will create or update an object store.
+		CreateOrUpdateObjectStore(ctx context.Context, cfg ObjectStoreConfig) (ObjectStore, error)
 		// DeleteObjectStore will delete the underlying stream for the named object.
 		DeleteObjectStore(ctx context.Context, bucket string) error
 		// ObjectStoreNames is used to retrieve a list of bucket names
@@ -253,10 +257,72 @@ const (
 	objDigestTmpl       = objDigestType + "%s"
 )
 
-// CreateObjectStore will create an object store.
 func (js *jetStream) CreateObjectStore(ctx context.Context, cfg ObjectStoreConfig) (ObjectStore, error) {
+	scfg, err := js.prepareObjectStoreConfig(ctx, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	stream, err := js.CreateStream(ctx, scfg)
+	if err != nil {
+		if errors.Is(err, ErrStreamNameAlreadyInUse) {
+			// errors are joined so that backwards compatibility is retained
+			// and previous checks for ErrStreamNameAlreadyInUse will still work.
+			err = errors.Join(fmt.Errorf("%w: %s", ErrBucketExists, cfg.Bucket), err)
+		}
+		return nil, err
+	}
+	pushJS, err := js.legacyJetStream()
+	if err != nil {
+		return nil, err
+	}
+
+	return mapStreamToObjectStore(js, pushJS, cfg.Bucket, stream), nil
+}
+
+func (js *jetStream) UpdateObjectStore(ctx context.Context, cfg ObjectStoreConfig) (ObjectStore, error) {
+	scfg, err := js.prepareObjectStoreConfig(ctx, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	// Attempt to update the stream.
+	stream, err := js.UpdateStream(ctx, scfg)
+	if err != nil {
+		if errors.Is(err, ErrStreamNotFound) {
+			return nil, fmt.Errorf("%w: %s", ErrBucketNotFound, cfg.Bucket)
+		}
+		return nil, err
+	}
+	pushJS, err := js.legacyJetStream()
+	if err != nil {
+		return nil, err
+	}
+
+	return mapStreamToObjectStore(js, pushJS, cfg.Bucket, stream), nil
+}
+
+func (js *jetStream) CreateOrUpdateObjectStore(ctx context.Context, cfg ObjectStoreConfig) (ObjectStore, error) {
+	scfg, err := js.prepareObjectStoreConfig(ctx, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	stream, err := js.CreateOrUpdateStream(ctx, scfg)
+	if err != nil {
+		return nil, err
+	}
+	pushJS, err := js.legacyJetStream()
+	if err != nil {
+		return nil, err
+	}
+
+	return mapStreamToObjectStore(js, pushJS, cfg.Bucket, stream), nil
+}
+
+func (js *jetStream) prepareObjectStoreConfig(ctx context.Context, cfg ObjectStoreConfig) (StreamConfig, error) {
 	if !validBucketRe.MatchString(cfg.Bucket) {
-		return nil, ErrInvalidStoreName
+		return StreamConfig{}, ErrInvalidStoreName
 	}
 
 	name := cfg.Bucket
@@ -294,17 +360,7 @@ func (js *jetStream) CreateObjectStore(ctx context.Context, cfg ObjectStoreConfi
 		Compression: compression,
 	}
 
-	// Create our stream.
-	stream, err := js.CreateStream(ctx, scfg)
-	if err != nil {
-		return nil, err
-	}
-	pushJS, err := js.legacyJetStream()
-	if err != nil {
-		return nil, err
-	}
-
-	return mapStreamToObjectStore(js, pushJS, name, stream), nil
+	return scfg, nil
 }
 
 // ObjectStore will look up and bind to an existing object store instance.
diff --git a/jetstream/test/object_test.go b/jetstream/test/object_test.go
index 7b9d85fc2..e315797f3 100644
--- a/jetstream/test/object_test.go
+++ b/jetstream/test/object_test.go
@@ -1,4 +1,4 @@
-// Copyright 2023 The NATS Authors
+// Copyright 2023-2024 The NATS Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -129,6 +129,69 @@ func TestObjectBasics(t *testing.T) {
 	expectErr(t, err, jetstream.ErrBucketNotFound)
 }
 
+func TestCreateObjectStore(t *testing.T) {
+	s := RunBasicJetStreamServer()
+	defer shutdownJSServerAndRemoveStorage(t, s)
+
+	nc, js := jsClient(t, s)
+	defer nc.Close()
+	ctx := context.Background()
+
+	// invalid bucket name
+	_, err := js.CreateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST.", Description: "Test store"})
+	expectErr(t, err, jetstream.ErrInvalidStoreName)
+
+	_, err = js.CreateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "Test store"})
+	expectOk(t, err)
+
+	// Check that we can't overwrite existing bucket.
+	_, err = js.CreateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "New store"})
+	expectErr(t, err, jetstream.ErrBucketExists)
+
+	// assert that we're backwards compatible
+	expectErr(t, err, jetstream.ErrStreamNameAlreadyInUse)
+}
+
+func TestUpdateObjectStore(t *testing.T) {
+	s := RunBasicJetStreamServer()
+	defer shutdownJSServerAndRemoveStorage(t, s)
+
+	nc, js := jsClient(t, s)
+	defer nc.Close()
+	ctx := context.Background()
+
+	// cannot update a non-existing bucket
+	_, err := js.UpdateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "Test store"})
+	expectErr(t, err, jetstream.ErrBucketNotFound)
+
+	_, err = js.CreateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "Test store"})
+	expectOk(t, err)
+
+	// update the bucket
+	_, err = js.UpdateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "New store"})
+	expectOk(t, err)
+}
+
+func TestCreateOrUpdateObjectStore(t *testing.T) {
+	s := RunBasicJetStreamServer()
+	defer shutdownJSServerAndRemoveStorage(t, s)
+
+	nc, js := jsClient(t, s)
+	defer nc.Close()
+	ctx := context.Background()
+
+	// invalid bucket name
+	_, err := js.CreateOrUpdateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST.", Description: "Test store"})
+	expectErr(t, err, jetstream.ErrInvalidStoreName)
+
+	_, err = js.CreateOrUpdateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "Test store"})
+	expectOk(t, err)
+
+	// update the bucket
+	_, err = js.CreateOrUpdateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: "TEST", Description: "New store"})
+	expectOk(t, err)
+}
+
 func TestGetObjectDigestMismatch(t *testing.T) {
 	s := RunBasicJetStreamServer()
 	defer shutdownJSServerAndRemoveStorage(t, s)