John Helder Wedge (1793 – 22 November 1872) was a surveyor, explorer and politician in Van Diemen's Land (now Tasmania, Australia). Wedge was the second son of Charles Wedge of Shudy Camps, of Cambridgeshire, England. John Wedge learned the basics of surveying from his father. Due to financial losses during the post-war depression in agriculture, Wedge and his brother Edward decided to migrate to Van Diemen's Land; before leaving London Wedge had obtained an appointment in the colony as assistant surveyor.