is a Slovak football coach and former player who played as a midfielder. He is currently the team manager and assistant coach for the Slovakia national team.

After beginning his club career with Slovan Bratislava in 2004, Hamšík moved to Italian club Brescia later that year. In 2007, he was purchased by newly promoted Serie A club Napoli, where he became a mainstay in the squad's starting line-up. His energy, leadership, creativity, skill and eye for goal from midfield saw him play a key role in helping the team to two Coppa Italia titles and a Supercoppa Italiana. He scored 121 goals for the club and collected 521 appearances in all competitions during his twelve seasons with the team, and also served as the club's captain between 2014 and 2019; he became the club's all-time top goalscorer in 2017 (taken over from Maradona and surpassed by Dries Mertens in 2020), and the club's all-time appearance holder in 2018. In February 2019, Hamšík joined Chinese club Dalian Professional. He signed for Turkish side Trabzonspor in 2021, winning a Süper Lig title, before announcing his retirement in 2023. He also formerly captained the Slovakia national team from 2007 until his retirement from the national team.

At international level, Hamšík helped Slovakia qualify for the country' first ever FIFA World Cup, captaining the side at the 2010 tournament as they reached the round of 16 following a victory over defending champions Italy. He would go on to lead his nation to European Championship qualification for the first time in 2016, as they once again reached the second round of a major tournament; a second consecutive European Championship appearance would follow for Hamšík in 2020. From 2007 to 2023, Hamšík collected 138 international caps at senior level, scoring 26 goals, and in 2018 became Slovakia's most capped player ever. In 2019, he scored his 25th international goal, overtaking Róbert Vittek as the nation's all-time top scorer.

For his performances, Hamšík has also won several individual awards: he is an eight-time winner of the Slovak Footballer of the Year Award, and he was named Serie A Young Footballer of the Year in 2008. In 2011, 2016 and 2017, he was named to the Serie A Team of the Year, and in 2015, he was included in the UEFA Europa League Squad of the season. In 2013, Hamšík was ranked as the eighth best footballer in Europe by Bloomberg.