Encyclopedias, Almanacs, Transcripts, and Maps
- Machias, Maine
- Machine Breaking
- Machine Tractor Stations
- Mackenzie, Ada Charlotte
- Mackey, William Wellington
- MacLean's Corps
- MacLean, Allan
- MacLean, Francis
- Macmillan, Harold (1897–1986)
- Mad Anthony
- Madame de Pompadour
- Madame Roland
- Madame Satã (Dos Santos, João Francisco)
- Madeira and the Azores
- Madeleine May Kunin
- Madness and Melancholy
- Madog ab Owain Gwynedd
- madrigals
- Mafia Capitalism
- Magellan, Ferdinand (Fernão Magalhães; c. 1480–1521)