is an Argentine football manager and former player who is the current head coach of Major League Soccer club Inter Miami. As a player, he played as a centre-back or defensive midfielder, most notably for Liverpool, Barcelona and the Argentina national team, being heralded as one of the best defenders and midfielders of his generation.

Mascherano began his career at River Plate, where he earned his first senior honours, the Argentine Primera División, in the 2003–04 season. He moved to Brazilian side Corinthians in 2005, winning the Brazilian Série A that same year, and then joined West Ham United in the Premier League; however, his brief time with the Hammers was blighted by unusual contract terms with Global Soccer Agencies. At the beginning of 2007, Mascherano was loaned out to Liverpool and reached the UEFA Champions League final. Afterwards, his deal was made permanent for £18.7 million. He left for Barcelona in 2010, winning five La Liga titles, two Champions Leagues and two FIFA Club World Cups among other honours, in eight years before having stints in China and his native Argentina.

Mascherano made 147 appearances for the Argentina national team and is the second most capped player in the country's history (after Lionel Messi). From his debut in 2003 until his retirement in 2018, he represented the nation at five Copa América tournaments, finishing runner-up in 2004, 2007, 2015, and 2016, and four FIFA World Cups, reaching the 2014 final. He twice won a gold medal at the Summer Olympics, in 2004 and 2008, becoming the first male footballer to achieve this double feat since Hungarian defender Dezső Novák in 1968. Between 2008 and 2011, Mascherano served as the captain of Argentina.