HMS Andrew (P423), was an Amphion-class submarine of the Royal Navy, built by Vickers Armstrong and launched on 6 April 1946. The submarine was fitted with a 4 inch deck gun in 1964 for service during the Indonesia–Malaysia confrontation to counter blockade running junks. The gun was fired for the last time in December 1974. She was sold off in 1977 and was broken up HMS Andrew made several claims to submarine history: