John K. Ryerson (July 16, 1820 – December 17, 1890) was a merchant and political figure in Nova Scotia, Canada.
He was born in Annapolis Royal, Nova Scotia, the son of Stephen D. Ryerson, and was educated there and in Yarmouth.
With his business partner Nathan Moses of Yarmouth, Ryerson was involved in trade with the West Indies.
[1] He was also a member of the board of governors for Yarmouth Seminary and a director of the Atlantic Marine Insurance Company.
He ran unsuccessfully for reelection in 1871 but was elected again in an 1872 by-election held after William H. Townsend resigned his seat due to poor health.