Juan Marcos Foyth (born 12 January 1998) is an Argentine professional footballer who plays as right-back for La Liga club Villarreal and the Argentina national team.

Having begun his professional career at his hometown club Estudiantes, he went on to play in the Premier League for Tottenham Hotspur and in La Liga for Villarreal.

Foyth made his senior international debut for Argentina in 2018 and was part of their squad that came third at the 2019 Copa América and won the 2022 Finalissima and 2022 FIFA World Cup.

[15] He made his debut on 22 October, scoring in a 5–3 home win over Turkey's Sivasspor in the group stage of the UEFA Europa League.

[19] He became a key player at right-back for manager Unai Emery, replacing veteran Mario Gaspar and covering for the injured Serge Aurier.

[22] Foyth was called up for the first time to the senior Argentina national team by manager Lionel Scaloni for a number of friendly games to be played in October 2018.

[28][29] On 1 June 2022, Foyth remained as an unused substitute as Argentina won 3–0 against reigning European Champions Italy at Wembley Stadium in the 2022 Finalissima.