Bernard Joseph McCahill (born 28 June 1964) is a former rugby union player from New Zealand who played for Auckland RFU and the All Blacks.
As well as two World Cup tournaments, he participated in 5 overseas tours.
McCahill was first chosen for the first World Cup in 1987 and played in the pool match against Argentina and was a replacement in the quarter-final against Scotland and the semi-final against Wales.
He was a backup midfield player until 1991, when he played in four of the World Cup matches.
He is the brother of Sean McCahill, a former Irish rugby international.