Arthur Stephen "Ash" Hennessy (24 September 1876 – 19 September 1959) was an Australian pioneer rugby league identity. He was a seminal figure in the creation of the South Sydney Rabbitohs for whom he played and later coached. He was a state and national representative hooker/forward and was the first captain of the Australian national rugby league team. He played for New South Wales in the first rugby match run by the newly created 'New South Wales Rugby Football League' which had just split away from the established New South Wales Rugby Football Union. He later coached at club, state and national representative levels.