HMS Mauritius, pennant C80, was a Fiji-class light cruiser of the Royal Navy. The ship was built by Swan Hunter, Newcastle upon Tyne. She was named after Mauritius, which was a British colony when she was built and entered service in 1941.

The Fiji-class cruisers were a class of eleven light cruisers of the Royal Navy that saw extensive service throughout the Second World War. Each ship of the class was named after a Crown colony or other constituent territory of the British Commonwealth and Empire. The class was also known as the Colony class, or Crown Colony class. Developed as more compact versions of the preceding Town-class cruisers, the last three were built to a slightly modified design and were sometimes also called the Ceylon class.