is an English professional footballer who plays as a midfielder for Eredivisie club Ajax, which he captains, and the England national team. He is noted for his leadership, versatility, and physicality.

Henderson joined the Sunderland Academy at the age of eight, making his first-team debut a decade later in November 2008. He spent six months on loan at Coventry City in 2009, before returning to Sunderland. In 2011, Henderson signed for Liverpool, winning his first trophy with the club, the League Cup, one year later. Appointed Liverpool captain in 2015, Henderson won the UEFA Champions League, the UEFA Super Cup and the FIFA Club World Cup in 2019, and in 2020 led his team to the Premier League title. For his performances in the title-winning season, Henderson was named FWA Footballer of the Year. In 2022, Henderson won the FA Cup and the EFL Cup, with Liverpool beating Chelsea on penalties in both finals.

An England international, Henderson has over 80 appearances for his country since his debut in 2010. He has appeared at six international tournaments with England, the 2012, 2016 and 2020 UEFA European Championships and the 2014, 2018 and 2022 FIFA World Cups. He was the first player to win the England Player of the Year award at both the U-21 and senior level.