Captain Sir Robert Mends (c. 1767 – 4 September 1823) was a prominent British Royal Navy officer of the late eighteenth and early nineteenth century, who lost an arm in the American War of Independence, caught in an explosion at the Battle of Groix in 1795 and wounded again at the action of 6 April 1809. In 1815 he was made a Spanish knight for his services in the Peninsular War and was awarded a pension of £300 a year from the British government. He remained in service at the end of the Napoleonic Wars and in 1821 was made commodore on the West African station, on which he died in 1823.