Willard Zebedee "Bud" Estey CC (October 10, 1919 – January 25, 2002) was a Canadian justice of the Supreme Court of Canada.
He was the son of James Wilfred Estey, a puisne justice of the Supreme Court of Canada, and Muriel Baldwin.
From 1946 he taught at the University of Saskatchewan and then moved to Ontario the following year to practice law.
He was appointed to the Supreme Court of Canada in 1977 to replace Wilfred Judson.
Estey was appointed a trustee of the Stanley Cup in 1984 on the nomination of Red Dutton, succeeding Clarence Campbell.