William Nassau Kennedy (28 April 1839 – 3 May 1885) was the second Mayor of Winnipeg, Manitoba from 1875 to 1876.

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 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.