The Istana Batu Royal Museum (Malay: Muzium Diraja Istana Batu) is a museum in Kota Bharu, Kelantan, Malaysia.

[1] Sultan Yahya Petra lived in the building until 1960 and moved to Kota Lama Palace once he ascended the throne.

After he moved out, the building was renovated and became the official residence of Tengku Salwani binti Sultan Yahya Petra until 1969.

On 25 July 1991, the building was converted into a museum and officiated by Sultan Ismail Petra.

[4] The museum displays various belongings of the Sultan of Kelantan, such as photographs, costumes, artifacts, furniture etc.