William Peter Gurnick is a New Zealand former rugby league player who represented his country in the 1972 and 1975 World Cups.
Gurnick won the Bert Humphries Memorial medal while playing for the Otahuhu Leopards in 1972 as the most improved forward in the Auckland Rugby League competition. He was selected for the New Zealand Kiwis that year, making his debut against France in that year's World Cup. He missed out on New Zealand selection in 1973, but did represent Auckland. He was again picked for New Zealand in 1974 and in 1975 was included in the 1975 World Cup squad.