Willard Zebedee "Bud" Estey OC (October 10, 1919 – January 25, 2002) was a Canadian justice of the Supreme Court of Canada. Estey was born in Saskatoon, Saskatchewan. He was the son of James Wilfred Estey, a puisne justice of the Supreme Court of Canada, and Muriel Baldwin. He studied at the University of Saskatchewan earning a BA in 1940 and an LL.B in 1942. He joined the armed forces and fought during World War II, including acting as a Canadian Observer with US forces during the battle for Okinawa. Upon returning to Canada went to study at Harvard Law School and received a LL.M in 1946.