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- Mastretta, Ángeles (1949–)
- Mastrogiovanni, Antonio (1936–)
- Mata, Eduardo (1942–1995)
- Matacapán
- Mataco
- Matamoros y Guridi, Mariano (1770–1814)
- Matanza
- Mathematics, Foundations of
- Mather, Cotton (1663–1728)
- Mathewson, Christopher ("Christy")
- Mathias, Robert Bruce ("Bob")
- Matienzo, Benjamín (1891–1919)
- Matienzo, José Nicolás (1860–1936)
- Mato Grosso do Sul
- Matos, Gregório de (1636–1696)
- Matsigenka
- Matsigenka
- Matson, James Randel ("Randy")
- Matson, Oliver Genoa, II ("Ollie")
