Arthur Gabriel Santana Marcolino (born 4 September 2005), known as Arthur Gabriel or simply Arthur, is a Brazilian professional footballer who plays as a left-back for Palmeiras. Club career Born in São Paulo, Arthur joined the youth categories of Palmeiras in 2017, aged 11. On 5 August 2025, after establishing himself in the under-20 team, he renewed his contract until 2029. On 12 January 2026, after Jefté suffered an injury, Arthur was registered in the first team squad for the 2026 Campeonato Paulista. He made his senior debut six days later, starting in a 1–0 home win over Mirassol. International career In September 2025, Arthur was called up to the Brazil national under-20 team for a period of trainings.