HMS Sirius (1892)
 HMS Sirius was an Apollo-class cruiser of the British Royal Navy which served from 1892 to 1918 in various colonial posts such as the South and West African coastlines and off the British Isles as a hastily converted minelayer during the First World War. In April 1918 Sirius was deliberately scuttled in the mouth of Ostend harbour in Belgium during the failed First Ostend Raid.