John Lineham (21 March 1857 – 21 April 1913) was a territorial-level politician and businessman from Northwest Territories, Canada. Lineham was born 21 March 1857 to Thomas Lineham and Barbara McIntyre in Mitchell, Upper Canada. He married Mary Elizabeth Martin in Collingwood, Ontario on 21 March 1894 and have two daughters. Lineham would head to Brandon, Manitoba and enter the cattle business, and later in 1883 he went to Calgary ahead of the Canadian Pacific Railway. Lineham purchased A. P. Samples' butcher shop with a partner and formed a successful meat business under the name "Dunn and Lineham", which would eventually be sold to William Roper Hull and later Patrick Burns.