•
Piotr Salaber (born 1966), Polish composer, conductor, and pianist •
Piotr Samiec-Talar (born 2001), Polish footballer •
Piotr Sarata (fl. 1980s), Polish slalom canoeist •
Piotr Sawczuk (born 1962), Polish Roman Catholic bishop •
Piotr Semenenko (1814–1886), Polish theologian of the Roman Catholic Church •
Piotr Setkiewicz (born 1963), Polish historian •
Piotr Siejwa, Polish para athlete •
Piotr Siemionowski (born 1988), Polish sprint canoeist •
Piotr Skarga (1536–1612), Polish Jesuit, preacher, hagiographer, and polemicist •
Piotr Skiba (born 1982), Polish football goalkeeper •
Piotr Skierski (born 1971), Polish table tennis player •
Piotr Skowron (born 1985), Polish professor of Computer science •
Piotr Skowyrski (fl. 2010s), better known as Izak, Polish esports commentator and social media personality •
Piotr Skrobowski (born 1961), Polish footballer •
Piotr Skrzynecki (1930–1997), Polish choreographer, director and cabaret impresari •
Piotr Skuratowicz (1891–1940), Polish general •
Piotr Słonimski (1922–2009), Polish-born French geneticist •
Piotr Ślusarczyk (born 1979), Polish politician •
Piotr Śmietański (1899–1950), Polish non-commissioned officer and communist functionary •
Piotr Smoleński (died 1942), Polish cryptographer • Piotr Snopek (born 1991), Polish pair skater •
Piotr Kmita Sobieński (1477–1553), Polish nobleman •
Piotr Sobociński (1958–2001), Polish cinematographer •
Piotr Sobotta (born 1940), Polish high jumper •
Piotr Soczyński (born 1967), Polish footballer •
Piotr Sowisz (born 1971), Polish footballer •
Piotr Stachiewicz (1858–1938), Polish painter and illustrator •
Piotr Starzyński (born 2004), Polish footballer •
Piotr Stawarczyk (born 1983), Polish footballer •
Piotr Stańczak (c. 1966–2009), Polish geologist •
Piotr Steinkeller (1799–1854), Polish entrepreneur •
Piotr Stępień (born 1963), Polish wrestler •
Piotr Stoiński (multiple people) •
Piotr Stokowiec (born 1963), Polish wrestler •
Piotr Świderski (born 1983), Polish speedway rider •
Piotr Świerczewski (born 1972), Polish footballer •
Piotr Świst (born 1968), Polish speedway rider •
Piotr Świtalski (born 1957), Polish diplomat •
Piotr Suski (1942–2009), Polish footballer •
Piotr Szarek (1908–1939), Polish Catholic clergyman •
Piotr Szarpak (born 1971), Polish footballer •
Piotr Szczechowicz (born 1976), Polish football manager •
Piotr Szczepanik (1942–2020), Polish singer •
Piotr Szczepański (born 1988), Polish canoeist •
Piotr Szczotka (born 1981), Polish basketball player •
Piotr Szczypa (born 1948), Polish figure skater and figure skating coach •
Piotr Szczęsny (1963–2017), Polish chemist •
Piotr Sztompka (born 1944), Polish sociologist •
Piotr Szulczewski (born 1981), Polish businessman and computer engineer •
Piotr Szulkin (1950–2018), Polish film director and writer •
Piotr Szyhalski (born 1967), Polish-born multimedia artist in the United States •
Piotr Szymiczek (born 1982), Polish footballer ==T==