The Singapore national football team (Malay: Pasukan bola sepak kebangsaan Singapura, Chinese: 新加坡國家足球隊, Tamil: சிங்கப்பூர் தேசிய கால்பந்து அணி) represents the Republic of Singapore in the senior men's international football. It is organised by the Football Association of Singapore (FAS), the governing body of football in Singapore, which is affiliated with the Asian Football Confederation (AFC) and the regional ASEAN Football Federation (AFF). The current head coach is Takayuki Nishigaya. The team's colours are red and white. Singapore are colloquially known as "The Lions".

Singapore has one of the oldest national teams in Asia, with the FAS being the oldest football association in the continent itself. Despite the country having a relatively small population pool, it has generally punched above its weight by successively producing squads that has fiercely competed with its larger and much more populated neighbours.

This can be seen in its most significant successes, which have come in the regional AFF Championship, whereby Singapore had won four times in 1998, 2004–05, 2007, and 2012. Singapore was the first team to achieve this feat and the only team to win in all the finals that they had played. In 1998, Singapore defeated Vietnam in the final to capture the country's first major international football title. In the 2004–05 competition, Singapore defeated Indonesia in a two-leg final 5–2 on aggregate. Singapore retained the trophy in 2007, beating Thailand 3–2 on aggregate in the final. In 2012, Singapore won the trophy a record 4th time, again defeating three-time champions Thailand 3–2 on aggregate in the final.

Singapore has also achieved notable results beyond its sub-confederation. In the 2007 AFC Asian Cup qualification, Singapore became the only team to beat Iraq where Iraq was en route to their Asian Cup-winning campaign. Singapore also drew with China 0–0 and 1–1 at home in 2006 and 2009 respectively. In March 2008, Australia also failed to beat Singapore when the game ended in a goalless draw. During the 2018 FIFA World Cup qualifiers, Japan was held to a draw at home at the Saitama Stadium by Singapore, being the only game where they had dropped points in the group.