John Marchbank (19 January 1883 – 25 March 1946) was a Scottish trade unionist. Born in in Dumfriesshire, Marchbank worked in his youth as an assistant to his father, who was a shepherd. He moved to work for the Caledonian Railway Company when he reached eighteen and, other than a short period in the , spent the remainder of his working life on railway matters. Marchbank retired from his posts at the NUR 1943, but was asked to remain in his international post until the first post-war conference of the federation. Ultimately, he died a few months before it was held.