| Kim Ryun-seong | |
| Birth Date: | 4 June 2002 |
| Birth Place: | South Korea |
| Height: | 1.75 m |
| Currentclub: | Pohang Steelers |
| Clubnumber: | 12 |
| Position: | Defender |
| Youthyears1: | 2018–2020 |
| Youthclubs1: | Pohang Steel High School |
| Years1: | 2021– |
| Caps1: | 14 |
| Goals1: | 0 |
| Years2: | 2022–2023 |
| Clubs2: | Gimcheon Sangmu (army) |
| Caps2: | 15 |
| Goals2: | 0 |
| Nationalyears1: | 2017–2019 |
| Nationalteam1: | South Korea U17 |
| Nationalcaps1: | 13 |
| Nationalgoals1: | 0 |
| Club-Update: | 20 February 2022 |
| Hangul: | 김륜성 |
| Hanja: | 金侖成 |
| Mr: | Kim Ryun-sŏng |
| Rr: | Gim Yun-seong |
Kim Ryun-seong (; born 4 June 2002) is a South Korean footballer who plays as a defender for Pohang Steelers.
| Club | Season | League | National cup | Continental | Other | Total | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Division | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | |||
| Pohang Steelers | 2021 | K League 1 | 13 | 0 | 1 | 0 | 4 | 0 | 0 | 0 | 18 | 0 | |
| 2022 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Career total | 13 | 0 | 1 | 0 | 4 | 0 | 0 | 0 | 18 | 0 | |||