Sociedade Esportiva Palmeiras (Brazilian Portuguese: [sosieˈdadʒi ispoɾˈtʃivə pawˈmejɾəs] (listen)), commonly known as Palmeiras, is a Brazilian professional football club based in the city of São Paulo, in the district of Perdizes. Palmeiras is one of the most popular clubs in South America, with around 18 million supporters and more than 130,000 affiliated fans. Despite being primarily a football club, Palmeiras competes in a number of different sports. The football team plays in the Campeonato Paulista, the state of São Paulo's premier state league, as well as in the Brasileirão Série A, the top tier of the Brazilian football league system.

Palmeiras was founded by Italian immigrants in 1914, as "Palestra Itália" (pronounced [paˌlɛstɾiˈtaliɐ]). However, the club changed its name on 14 September 1942, as a result of Brazil joining the Allies in the Second World War against Italy ("Itália" in Portuguese) and the Axis powers. Since then, Palmeiras has won 17 top-tier national competitions, including a record 11 Campeonato Brasileiro Série A, 4 Copas do Brasil, 1 Copa dos Campeões, and 1 Supercopa do Brasil making it the most successful club in top-tier domestic competitions in Brazil. In international club football, the Big Green has won the first ever Intercontinental Cup known as International Champions Cup or ‘Copa Rio’ in 1951, the 1999, 2020 and 2021 Copa Libertadores, the 2022 Recopa Sudamericana, and the 1998 Copa Mercosul. The club has also been successful at a regional level as they have won 5 Interstate titles (Torneio Rio – São Paulo), and 24 State Championship titles (Campeonato Paulista).

Palmeiras currently occupies the second position on both CBF and CONMEBOL rankings, and was the first Brazilian club to win the IFFHS Men's Club World Ranking in 2021.

The squads for all five FIFA World Cups won by Brazil have had at least one Palmeiras player in them.