William Paul Joseph Haynes (March 1, 1909 in Montreal, Quebec – May 12, 1989) was a Canadian ice hockey forward.

Haynes started his National Hockey League career with the Montreal Maroons.

He discovered future stars Elmer Lach and Ken Reardon for the Canadiens after getting injured and being sent on a scouting tour of the West.

His career ended when he was cut by Canadiens coach Dick Irvin for skipping practice in New York to attend the opera.

[1] This biographical article relating to a Canadian ice hockey centre born in the 1910s is a stub.