The 2020–21 season was the 135th in the history of Luton Town Football Club, a professional association football club based in Luton, Bedfordshire, England. Their 19th-place finish in 2019–20 meant it was the club's second consecutive season in the Championship and 95th season in the English Football League. Luton were eliminated in the third round of the 2020–21 EFL Cup, after being beaten 3–0 at home to Premier League club Manchester United, and lost 3–1 away to Chelsea, also of the Premier League, in the FA Cup fourth round.