HMS Andrew (P423/S23/S63), 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 (102 mm) 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.