The 2021 Four Nations Football Tournament, alternatively known as the Mahinda Rajapaksa Cup, was an international association football friendly tournament organised by Football Sri Lanka (FSL). It took place from 9 to 19 November 2021 at the Colombo Racecourse in Colombo.

The Sri Lanka national football team represents Sri Lanka in Association football and is administered by Football Federation of Sri Lanka, the governing body of football in Sri Lanka. They have been a member of FIFA since 1952 and a member of AFC since 1954. Sri Lanka's home stadium is the Sugathadasa Stadium in Colombo. The Sri Lankan team was known as the Ceylon national football team until 1972 when Ceylon was renamed Sri Lanka.