William Obadiah Baizley (May 25, 1917 – May 3, 2000) was a politician in Manitoba, Canada. He was a Progressive Conservative member of the Legislative Assembly of Manitoba from 1959 to 1969, and served as a cabinet minister in the governments of Dufferin Roblin and Walter Weir.
Born in Montreal, Quebec, the son of William Daniel Baizley and Esther May Tanner, Baizley was educated at Glenlawn Collegiate in St. Vital, Manitoba and the Lincoln Chiropractic College in Indiana. He returned to Manitoba in 1937 and worked as a chiropractor, also serving as president of the Manitoba Chiropractors' Association before entering political life. During World War II, he was a member of the Royal Canadian Air Force.