- Manners and customs.1
- Manuscripts--Latin (Medieval and modern)--South Carolina--Columbia1
- Maple leaf (Emblem)1
- Marching bands--England.1
- Marching.1
- Marina, Duchess of Kent, 1906-1968.2
- Marriages of royalty and nobility.1
- Mary, Queen, consort of George V, King of Great Britain, 1867-1953.9
- McCarthy, Justin H. (Justin Huntly), 1860-1936.1
- McMaster, George Hunter--Correspondence1
- McMaster,Mrs. Rachel Buchanan--Correspondence1
- Medals.1
- Medical care.1
- Medicine.1
- Memorials.2
- Military ceremonies, honors, and salutes--England.2
- Military ceremonies, honors, and salutes.2
- Miners.1
- Models (Persons)1
- Monkeys.1