Admiral Arthur Hayes-Sadler, CSI (9 October 1865 – 9 February 1952) was a senior Royal Navy officer during World War I.

Born the son Sir James Hayes Sadler KCMG, Arthur Hayes-Sadler joined the Royal Navy in 1877.

[2] In May 1902 he was appointed navigation (N) officer to the pre-dreadnought battleship HMS Resolution, about to become flagship to Rear-Admiral George Atkinson-Willes, Second-in-Command of the Home Fleet during the Coronation Review for King Edward VII.

[3] Following the review, he was on 16 September appointed navigation officer to the battleship HMS Empress of India,[4] serving in the Home Fleet.

Promoted to rear admiral in July 1915, he was appointed Commander-in-Chief, Aegean Station with his flag in HMS Lord Nelson in August 1916.