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- Francisco Sá Carneiro, political leader (1990)
- Sacadura Cabral, aviator (1923; 1972)
- Ana Salazar, fashion designer (2004)
- António de Oliveira Salazar, prime minister, dictator (1971)
- Sam (1924-1993), cartoonist (his character Guarda Ricardo shown, 2005)
- José Saramago, novelist (1998)
- Luís Sanchez, fashion designer (2004)
- Sancho I, king (1955)
- Sancho II, king (1955)
- Sebastião Sanhudo (1851-1901), cartoonist (2005)
- Francisco dos Santos (1878-1930), sculptor (1971)
- Lúcia Santos, nun who saw visions of Mary (1992)
- Reynaldo dos Santos, physician and art historian (1999)
- Vasco Santana actor (1996)
- Sebastião I, king (1990)
- Carlos Seixas, composer (1974)
- António Sérgio, thinker and educator (1980)
- Alexandre de Serpa Pinto, explorer and colonial administrator (1980)
- José António Serrano (1851-1904), surgeon, anatomist (1966)
- Alfredo da Silva, industrialist (2008)
- António Silva, film actor (1996)
- Agostinho da Silva, philosopher (2006)
- Eusébio da Silva Ferreira, footballer (2005)
- Manuel da Silva Passos, politician (1986)
- Diogo de Silves, explorer (1990)
- José Simões de Almeida (sobrinho) (1880-1950), sculptor (1971)
- Tomé de Sousa, governor-general of Brazil (1972)
- João de Sousa Carvalho, composer (1974)
- Emília de Sousa Costa (1877-1959), feminist, child advocate and author (2009)
- Aristides de Sousa Mendes, diplomat (1995)
- Amadeo de Souza Cardoso, painter (1987)
- Heinrich von Stephan, German postmaster general (1999)
Read more about this topic: List Of People On Stamps Of Portugal