Air Vice-Marshal Cyril Eyton Kay, (25 June 1902 – 29 April 1993), known as Cyrus Kay, was a New Zealand aviator and military leader. Born in Auckland, Kay joined the Royal Air Force in 1926 for a five-year period of service, during which he attempted to break the record for the fastest flight from England to Australia. He remained in aviation in civilian life and was a participant in the MacRobertson Air Race of 1934.
