William Albert Mulcahy (born 7 January 1935 in Rathkeale, County Limerick, Ireland) is a retired Irish rugby union player.
University College Dublin R.F.C., Bective Rangers, Skerries RFC, Leinster, Ireland and the British and Irish Lions.
[3] He was part of Ireland's team when they recorded first test victories against Australia (1958) and South Africa (1965).
[citation needed] Mulcahy received his first Lions call-up in 1959 to tour Australia and New Zealand.
He played in 15 out of the 33 tour games, and earned 2 test caps, one against Australia on 6 June and the other against New Zealand on 19 September.