HMS Conqueror was a British Churchill-class nuclear-powered fleet submarine which served in the Royal Navy from 1971 to 1990. She was the third submarine of her class, following the earlier Churchill and Courageous, all designed to face the Soviet threat at sea. She was built by Cammell Laird at Birkenhead.

The three Churchill class, sometimes known as the Repeat Valiant-class submarines were nuclear-powered fleet submarines which served with the Royal Navy from the 1970s until the early 1990s. The Churchill class was based on the older Valiant class, but featured many internal improvements.