Yoon Jong-gyu (; born 20 March 1998) is a South Korean football defender who plays for Ulsan HD and the South Korea national team.
Jong-gyu joined FC Seoul in 2017.
He joined Ulsan HD FC in 2025.
He was part of the South Korea U-17 squad at the 2015 FIFA U-17 World Cup.
He was part of the South Korea U-20 squad at the 2017 FIFA U-20 World Cup.
He was part of the South Korea squad at the 2022 EAFF E-1 Football Championship.
He was part of the South Korea squad at the 2022 FIFA World Cup.
As of 22 November 2025
South Korea U23