HMS Ajax was a Leander-class light cruiser which served with the Royal Navy during World War II. She became famous for her part in the Battle of the River Plate, the Battle of Crete, the Battle of Malta and as a supply escort in the siege of Tobruk. This ship was the eighth in the Royal Navy to bear the name.

Ajax was decommissioned in February 1948 and scrapped in 1949

The town of Ajax, in Ontario, Canada, was named after the cruiser following the Battle of the River Plate