| William Nassau Kennedy | |
| Order: | 2nd |
| Office: | Mayor of Winnipeg |
| Predecessor: | Francis Evans Cornish |
| Successor: | Thomas Scott |
| Term Start: | 1875 |
| Term End: | 1876 |
| Birth Date: | 28 April 1839 |
| Birth Place: | Newcastle, Upper Canada |
| Death Place: | London, England |
William Nassau Kennedy (28 April 1839 - 3 May 1885) was the second Mayor of Winnipeg, Manitoba from 1875 to 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.[1]
Kennedy enlisted in the Peterborough Rifle Company in 1857.[1] He was commissioned as an ensign in 1865 and served during the Fenian raids. In 1867, Kennedy was gazetted as a captain in the newly formed 57th Peterborough Battalion of Infantry.[1] In 1870 he joined the Wolseley expedition to fight the Red River Rebellion in what is now Manitoba.
He remained in Manitoba after the fighting ended.[1]
He served in the Nile Expedition with the Nile Voyageurs. He was returning to Canada to command the 90th Winnipeg rifles in the North-West Rebellion.
He died in London from a disease contracted in Sudan on 3 May 1885 and was buried on the eastern side of Highgate Cemetery, almost opposite the tomb of Karl Marx.