Major John Dunwoodie Martin McCallum DSO CBE also known as "the wee major" (2 September 1883 - 14 January 1967) was a Northern Irish soldier, resident magistrate, sportsman, sports administrator, and president of the International Badminton Federation.

McCallum attended the Royal Academical Institution and Queen's University Belfast (QUB), from which he graduated in 1906.

[1] He joined the Territorial Force in 1908, and was posted to the QUB officers' training corps.

As part of the 36th (Ulster) Division, McCallum was posted to France in 1915 during World War I.

During the occupation of Cologne, he served as second-in-command of the 12th (Service) Battalion (Central Antrim), Royal Irish Rifles.