John Tiffin Stewart (18 November 1827 – 19 April 1913) was a notable New Zealand civil engineer and surveyor and mapper. He was born in Rothesay, Bute, Scotland, in 1827^[1] and was married to the social activist Frances Stewart. He is the father of Ellen Sarjeant who helped found the Sarjeant Gallery.

Much of Stewart's early surveying work was in Palmerston North. Stewart and his family later moved to Whanganui. The home they built in Campbell Street Whanganui was later the Karitane home, "Stewart House", and also a hostel for Whanganui City College.

He worked as engineer for the Whanganui River Trust helping clear channels on the river.