, known mononymously as Oscar, is a Brazilian professional footballer who plays as an attacking midfielder for Campeonato Brasileiro Série A club São Paulo and the Brazil national football team.

Oscar began his career at São Paulo, and in 2009, he went to court against the club due to irregularities in his contract. After a series of controversies, he left for Internacional, where he spent the next three years of his career. His displays for club and country led to him signing for Chelsea for a fee of R$61.575 million. After four and a half years with Chelsea, he signed for Chinese Super League club Shanghai SIPG (now known as Shanghai Port) for an Asian transfer record of £60 million in January 2017. He spent seven years in China before returning to his home country as he signed for his boyhood club, São Paulo.

Oscar is a Brazilian international and has represented his country at the under-20 level, at the 2012 London Olympics and at senior level. On 20 August 2011, Oscar scored three goals in the 2011 FIFA U-20 World Cup final win against Portugal, becoming the first player to score a hat-trick in the FIFA U-20 World Cup final. Oscar later described his performances at the tournament as being a \"gateway to the senior side\". His playing style and ability drew comparison to compatriot Kaká. Oscar made his senior debut for Brazil in 2011, and was a member of the squads that won the 2013 FIFA Confederations Cup and finished fourth at the 2014 FIFA World Cup, both on home soil.