HMS Dolphin was a Royal Navy shore establishment located in Gosport, England. It primarily served as a training base for submariners and was established in 1903. The facility played a crucial role in the development of submarine operations and tactics throughout the 20th century. The establishment was named after the Dolphin fish and was known for its advanced training programs. It included various facilities for teaching navigation, engineering, and other essential skills for submariners. HMS Dolphin was officially closed in 1993, marking the end of an important chapter in the history of the Royal Navy.