William Anthony Derlago (born August 25, 1958) is a Canadian former professional ice hockey player.
He played in the National Hockey League from 1978 to 1987 with the Vancouver Canucks, Toronto Maple Leafs, Boston Bruins, Winnipeg Jets and Quebec Nordiques.
Growing up, Derlago excelled at multiple sports, including golf, tennis, baseball, and hockey.
He achieved best success with ice hockey, playing with the Brandon Wheat Kings and setting a number of WCJHL records.
Though he played well in Vancouver, he was unable to live up to team expectations, and was traded to Toronto along with Rick Vaive for Tiger Williams and Jerry Butler on February 18, 1980.