James Michael Justin (born 23 February 1998) is an English professional footballer who plays as a full-back for Premier League club Leicester City.

[4] Following his breakthrough into the under-18 team, Justin also played regularly for the club's development squad that ended 2014–15 as champions of The Central League Southern Division.

[12] Justin broke into the first team in 2016–17, making his full debut at left-back in a 3–1 win at home to newly relegated Championship club Aston Villa in the EFL Cup first round on 10 August 2016.

[13] He suffered a calf injury in the warm up before Luton's 2–1 win away to Leyton Orient on 15 October,[14] and returned to the team for a 3–1 victory away to Exeter City in the FA Cup first round on 5 November.

[15][16] After making 14 appearances in all competitions during the first half of the season playing in a number of different positions including at right-back and as a left winger, Justin signed a new two-and-a-half-year contract to keep him at Luton until the summer of 2019, with the option of a further year.

[19] Justin scored his first professional goal in a 4–1 victory away to Accrington Stanley on 29 April 2017,[20] but was stretchered off after he suffered an ankle ligament sprain in the following match, a 3–1 win at home to Morecambe.

[29] An ACL injury cut short his involvement in Leicester City's victorious 2020–21 FA Cup campaign, but the highly regarded defender made his comeback in January 2022 against Tottenham and started in the five subsequent fixtures for the Foxes.

[38] Justin was called up to the England under-21 team for the first time on 30 August 2019 for two 2021 UEFA European Under-21 Championship qualification matches against Turkey and Kosovo.