William Osmund Kelly (December 10, 1909 – July 1974) was an American politician who served as mayor of Flint, Michigan.

[1] He also filled the position of President for Saint Matthew Men's Club, the Flint Bowling Association and the Michigan Chapter of the National Association of Postmasters.

He then attended Flint Junior College and formed a band, Oz Kelly and his Orchestra, while there.

The band played in Cleveland, Ohio, Milwaukee and Flint at the IMA Auditorium.

[3] During World War II, Kelly resigned to join the Navy and served two years in the Pacific.