Matthew Joseph Mack (3 March 1867 - 18 July 1951) was a New Zealand railway worker and trade unionist.
Mack was born in Wellington, New Zealand on 3 March 1867. He was a railway guard and Secretary of the Amalgamated Society of Railway Servants (1908–27).[1] Mack stood as New Zealand Labour Party candidate for Parnell in but disliked the party's stance on conscription in World War I. In 1918 he contested the Wellington Central by-election as an Independent Labour-Protestant Political Association candidate and came a very creditable runner-up to Labour's Peter Fraser.[2] Mack was President of the Alliance of Labour in 1924.