British admiral who planned and directed the World War I raid on the German base at Zeebrugge, Belg., April 22–23, 1918, and thus helped to close the Strait of Dover to German submarines.

Keyes entered the Royal Navy in 1885. For bold action during the Boxer Rebellion in China in 1900, he was promoted to commander. As commodore in charge of submarines (1910–14), he was partly responsible for the British victory in the Battle of Helgoland Bight (Aug. 28, 1914). In 1915 he was chief of staff for the unsuccessful Dardanelles expedition.

Appointed director of plans at the Admiralty in 1917, Keyes began to prepare operations for blocking the entrances to Zeebrugge and Ostend. On the first attempt, the mission at Zeebrugge succeeded, but the blockships could not find the Ostend entrance. Two weeks later, Keyes sent the Vindictive to Ostend, where its volunteer crew sank the ship at the harbour entrance, thus discouraging most German U-boat operations in Dover Command waters.

After the Armistice Keyes was made a baronet and received a government grant of £10,000. He held a number of commands, attaining the rank of admiral of the fleet from 1930. He sat in Parliament from 1934 until his elevation to the peerage in 1943. Briefly, in May 1940, he returned to prominence in an attack on Neville Chamberlain's conduct of World War II.

He wrote The Naval Memoirs of Admiral of the Fleet Sir Roger Keyes, 2 vol. (1934–35), and Adventures Ashore & Afloat (1939).