, known as Thiago Alcântara or mononymously as Thiago (Spanish: [ˈtjaɣo]; Brazilian Portuguese: [tʃiˈaɡu]), is a former professional footballer who played as a midfielder.

Born in Italy to Brazilian parents and raised in Spain, he is the eldest child of former player Mazinho. Thiago joined Barcelona aged 14, and made his first team debut in 2009. After winning honours including four La Liga titles, the UEFA Champions League and the FIFA Club World Cup for Barcelona, he was signed by Bayern Munich for €25 million in 2013. In Germany, Thiago won 16 trophies, including the Bundesliga seven times in a row, and the UEFA Champions League as part of a continental treble in his final year at the club. In 2020, he signed for Liverpool in a transfer worth an initial £20 million. His time at Liverpool was plagued by several injury problems; however, he won the FA Cup in 2022. Thiago has been selected in the FIFPRO Men's World 11 in 2020.

After helping Spain to European Championships at under-19 and under-21 levels, he made his full international debut in 2011. Thiago was part of the provisional squad for Spain in the 2014 FIFA World Cup but withdrew due to a knee injury. He was selected for UEFA Euro 2016, the 2018 World Cup, and Euro 2020.