Bernard Joseph McCahill (Bernie McCahill) was born on 28 June 1964 in Auckland, New Zealand. He was educated at St Peter's College. He is a former rugby union footballer who played for the All Blacks. He played in two positions, Second five-eighth and centre three-quarter. he played 32 matches for the All Blacks from 1987 until 1991 including 10 tests. As well as two World Cup tournaments, he participated in 5 overseas tours. He also appeared in five zonal matches, five trials and was in the New Zealand XV and New Zealand B selections in 1991. He scored four trys for New Zealand.

McCahill was first chosen for the first World Cup in 1987 and played in the pool match 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.