James Millar Jack (1847 or 1848 – 28 September 1912) was a Scottish trade unionist and politician.
Jack came to prominence as a member of the Associated Iron Moulders of Scotland (AIMS), and was elected as its general secretary in November 1879.[1] He also represented the union at the Trades Union Congress (TUC), and was elected to the TUC's Parliamentary Committee in 1884. He chaired the committee in 1887, and was re-elected most years until 1896.[2]
Jack was also interested in the political representation of workers, and was appointed as a vice-president of the Labour Electoral Association.[2] In 1890, he was elected to Glasgow Town Council, with the backing of the Glasgow Trades Council. He was only the second Liberal-Labour representative on the council.[3]
Under Jack, AIMS was a founding member of the Federation of Engineering and Shipbuilding Trades, and Jack served as its president for many years until his unexpected death in 1912.[2]