William Nassau Kennedy (28 April 1839 – 3 May 1885) was the second Mayor of Winnipeg, Manitoba from 1875 – 1876.
He was the first commander of The Royal Winnipeg Rifles.
Kennedy was born in Newcastle, Upper Canada (now Newcastle, Ontario) and was the second of six children of John Kennedy, a housepainter and lieutenant-colonel in the militia, and Catharine Lambert.Kennedy enlisted in the Peterborough Rifles in 1857.