John Lang (April 10, 1839 – November 21, 1921) was a farmer and political figure in Ontario, Canada.
He represented Peterborough East in the House of Commons of Canada from 1887 to 1891 and from 1896 to 1904 as an Independent Liberal member.
He was born in Keene, Upper Canada, the son of James Lang and Agnes Stewart, both natives of Scotland.
Lang was reelected in 1900, defeating John Albert Sexsmith.
This article about an Ontario Member of Parliament is a stub.