|Full name||John Sydney Millar|
|Date of birth||23 May 1934|
|Place of birth||Ballymena, Northern Ireland|
|Height||1.83 m (6 ft 0 in)|
|Weight||100 kg (15 st 10 lb)|
|Rugby union career|
|Years||Club / team|
|Years||Club / team||Caps||(points)|
John Sydney "Syd" Millar, CBE, MBE (born 23 May 1934) was an Irish rugby union prop who played international rugby for Ireland and the British Lions. After retiring from playing rugby he became a rugby coach and later rugby administrator, becoming chairman of the Irish Rugby Union in 1995 and from 2003 until 2007 was the chairman of the International Rugby Board.
Millar was born in Ballymena and previously played for Ballymena RFC and represented Ireland in the pack, winning 37 caps as a prop. In addition, he played nine times for the British and Irish Lions. Millar also coached the successful 1974 British Lions tour to South Africa and managed the 1980 British Lions tour to South Africa. Before becoming involved with rugby union's governing body, he served as manager of the Irish national side at the 1987 World Cup and as head of the Irish Rugby Union. Millar stepped down from his post following the 2007 World Cup.