is a Brazilian former professional footballer who played as a defensive midfielder, most notably for Brazilian side Atlético Mineiro and for English Premier League club Arsenal, as well as for the Brazil national team. He currently serves as an ambassador for both Arsenal and FIFA.

Born and raised in poverty in the Brazilian municipality of Lagoa da Prata, Gilberto joined the youth academy at local club América Mineiro, where he made his senior debut as a centre-back in 1998. After starring the following season, where he helped gain the club promotion into the Campeonato Brasileiro Série A, he joined city rivals Atlético Mineiro. During his time at Atlético, Gilberto transitioned into a defensive midfielder under head coach Carlos Alberto Parreira, and flourished in his new role, gaining a call-up to the Brazil national team for the 2002 FIFA World Cup, where he featured prominently as his country won the tournament.

As a result of his World Cup performances, Gilberto garnered a move to the Premier League to sign for Arsenal that summer for a fee of £4.5 million. During his six years at Arsenal, Gilberto gained a reputation as a world class defensive midfielder, and starred in a midfield duo alongside Patrick Vieira. He would feature as a member of the Invincibles, where he captured his first top-flight league title as his team went undefeated the whole season, as well as winning two FA Cups. Gilberto also holds distinct records at Arsenal, recording their first goal at the Emirates Stadium, as well as their fastest ever goal, scoring in 21 seconds from kickoff against PSV Eindhoven in the 2002–03 UEFA Champions League. After departing Arsenal, Gilberto relocated to Greece, playing for Panathinaikos, where he won a domestic double. He then returned to Brazil in 2011, signing for Grêmio, where he remained for two years, before returning to Atlético to win the 2013 Copa Libertadores prior to retiring.

Gilberto featured at senior level for much of his international career, representing Brazil over a period of 9 years. He enjoyed a period of sustained success with his country, as he featured prominently in their victorious campaign at the 2002 FIFA World Cup, as well as being a core component as the team also won the 2005 FIFA Confederations Cup, while also featuring as captain in their Copa América win in 2007. After retaining the Confederations Cup in 2009, Gilberto expressed his desire to prolong his club career, which coincided with limited playing time for Brazil. He retired from international football after the 2010 FIFA World Cup, having made 93 appearances for Brazil.