is an Indian professional footballer who plays as a forward for Indian Super League club Bengaluru and captains the India national team. He is the all-time top scorer in Indian Super League history. He is known for his link-up play, goal scoring abilities, and leadership. He is the fourth-highest international goalscorer, and is also the most-capped player and the all-time top goalscorer of the India national team. He is widely regarded as the greatest Indian football player of all time.

Chhetri began his professional career at Mohun Bagan in 2002, moving to JCT where he scored 21 goals in 48 games. Sunil was part of Delhi team in the 59th edition of Santosh Trophy held at Delhi. He scored six goals in that tournament including a hat-trick against Gujarat. Delhi lost to Kerala in the quarter-finals and he scored in that match too. He signed for Major League Soccer side Kansas City Wizards in 2010, becoming the third player from the subcontinent of note to go abroad. He returned to India's I-League where he played for Chirag United and Mohun Bagan before going back abroad, at Sporting CP of the Primeira Liga, where he played for the club's reserve side.

Chhetri helped India win the 2007, 2009, and 2012 Nehru Cup, as well as the 2011, 2015, 2021 and 2023 SAFF Championship. He also led India to victory in the 2008 AFC Challenge Cup, which qualified them to their first AFC Asian Cup in 27 years, scoring twice in the final tournament in 2011. In 2016, Chhetri led Bengaluru FC to a silver medal finish in the AFC Cup. Chhetri has also been named AIFF Player of the Year a record seven times in 2007, 2011, 2013, 2014, 2017, 2018–19 and 2021–22.

Chhetri received the Arjuna Award in 2011 for his outstanding sporting achievement, the Padma Shri award in 2019, India's fourth highest civilian award. In 2021, he received the Khel Ratna Award, India's highest sporting honor and became the first footballer to receive the award. He announced his retirement from all forms of international football in June 2024, playing his last match for India against Kuwait. On 6 March 2025 though, it was announced that Chhetri had come out of international retirement to help the national team.

His goal tally also ranks him fourth in the all-time list among international goal-scorers, behind Cristiano Ronaldo, Lionel Messi and Ali Daei. FIFA took to their official handle on X, to post a picture of the three then active top scorers.