Gu Sung-yun (, born 27 June 1994) is a South Korean professional footballer who plays as a goalkeeper for Seoul E-Land. He has also played for the South Korea national football team.
On 29 May 2020, Gu signed for K League 1 club Daegu. In an interview he expressed that he was happy signing for Daegu.
On 25 September 2022, it was announced that Gu would return to Hokkaido Consadole Sapporo for the 2023 J1 League season.
On 25 July 2023, Consadole loaned Gu Sung-yun to Kyoto Sanga until the end of the season.
Gu was part of the senior South Korea squad for the 2015 EAFF East Asian Cup.
Updated to 10 February 2026.
Hokkaido Consadole Sapporo
South Korea U-23
South Korea