M
- Gilka Machado, poet (1993) article in Portuguese
- Joaquim Maria Machado de Assis, writer (1940, 1958, 1989)
- José Vieira Couto de Magalhães, statesman and writer (1938) article in Portuguese
- Ferdinand Magellan, Portuguese navigator and explorer (1991)
- Anita Malfatti, painter (painting shown 1989)
- Emílio Luiz Mallet, artillery officer (1968) article in Portuguese
- Otávio Mangabeira, politician (1986) article in Portuguese
- Guglielmo Marconi, Italian inventor (1995)
- Rodrigo Melo Franco, writer (998)
- Marilyn Monroe, American actress (1996)
- Antônio Carlos de Mariz e Barros, naval officer (1966) article in Portuguese
- Joaquim Marques Lisboa, Marquis of Tamandaré, admiral (1954, 1957, 1997, 2008)
- Manuel Marques de Sousa, Count of Porto Alegre, general (1941)
- Carl Friedrich Philipp von Martius, German naturalist (drawings of plants shown 1994)
- Roberto Burle Marx, landscape architect (pictures of flowers shown 1995)
- Teresa de Marzo, aviatrix (2000) article in Portuguese
- João Baptista Mascarenhas de Morais, military leader (1983)
- Francisco Matarazzo Sobrinho, art collector and industrialist (1989) article in Portuguese
- Luiz de Matos, spiritualist (1960) article in Portuguese
- Gregório de Mattos e Guerra, poet (book cover shown 1986)
- Viscount of Mauá, industrialist and politician (1963, 2010)
- Joaquim Antônio Cordovil Maurity, naval officer (1941)
- Humberto Mauro, film director (1985)
- Amácio Mazzaropi, actor and filmmaker (1998)
- Cecília Meireles, poet (2001)
- Murilo Mendes, poet (2001)
- Mãe Menininha do Gantois, candomblé priestess (1994) article in Portuguese
- Júlio de Mesquita, journalist (1962) article in Portuguese
- Michiko, Japanese empress (1967)
- Francisco Mignone, composer (1997)
- Carmen Miranda, singer and actress (1990, 2009)
- José Bento Monteiro Lobato, author (1955, 1973)
- Dulcina de Moraes, stage actress (1998) article in Portuguese
- Prudente de Moraes, president (1906, 1942, 1991)
- Vinicius de Moraes, musician, composer and poet (1993)
- Leonardo Mota, writer (1991) article in Portuguese
- Sérgio Motta, engineer (1998, 2002) article in Portuguese
- Roberto Landell de Moura, priest and inventor (2011)
- Lauro Müller, politician (1964)
- Joaquim Murtinho, physician and politician (1954) article in Portuguese
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