William P. O'Neill (1909 – date of death unknown) was a New Zealand international lawn bowler.

[1] He competed in the first World Bowls Championship in Kyeemagh, New South Wales, Australia in 1966[2] and won a gold medal in the fours with Norm Lash, Ron Buchan and Gordon Jolly at the event.

[3] He won the 1954, 1960 and 1963 fours title at the New Zealand National Bowls Championships when bowling for the Carlton Bowls Club.

[4][5] He was inducted into the New Zealand Sports Hall of Fame.

[6]