William Lamb (December 15, 1902 – January 28, 1969) was a Scottish-Canadian professional golfer.

Having moved to Canada in 1924, he had a successful tournament career, highlighted by winning the Canadian PGA Championship on five occasions, in 1928, 1929, 1930, 1933, and 1935.

He also won the Millar Trophy, originally awarded for the Ontario PGA Match Play championship and later the Canadian PGA Match Play, in 1930 and the open championships of Ontario and Quebec.

He has also been inducted into the halls of fame of the PGA of Canada and Ontario Golf.

Lamb served as the head professional at several golf clubs in Ontario, most notably at Lambton Golf Club in Toronto, where he remained for 30 years until his retirement in 1964.