Willard Cleveland O'Brien (December 15, 1893 – November 6, 1981) was a physician and political figure in Nova Scotia, Canada.
Born in Noel, Nova Scotia, he graduated from Dalhousie Medical School in 1919.
He served as the mayor of Wedgeport, Nova Scotia from 1936 to 1942 and he represented Yarmouth County in the Nova Scotia House of Assembly from 1956 to 1963 as a Liberal member.
He ran for reelection in 1963 but lost by 165 votes to George A. Burridge.
This article about a Liberal party Member of the Nova Scotia House of Assembly is a stub.