| In Chang-soo | |
| Birth Date: | 1972 11, df=yes |
| Birth Place: | Seoul, South Korea |
| Position: | Defender |
| Years1: | 1994–1995 |
| Manageryears1: | 2008 |
| Managerclubs1: | Ansan Hallelujah (caretaker) |
| Manageryears2: | 2013–2015 |
| Managerclubs2: | Pocheon Citizen |
| Manageryears3: | 2016 |
| Managerclubs3: | Seoul E-Land (caretaker) |
| Manageryears4: | 2017–2018 |
| Managerclubs4: | Seoul E-Land |
In Chang-soo (; born 23 November 1972) is a former South Korean footballer and coach. He holds Argentine citizenship.
In was born in South Korea. When he was a child, he emigrated to Argentina. His Argentine name is Diego.[1]
In Chang-soo played for E-Land Puma during 1994 and 1995.[2]
In 2006, he started his coaching career in Ansan Hallelujah.
On 5 December 2017, he was appointed as manager of Seoul E-Land.[3]
In 2019, In was appointed as assistant manager of South Korea under-20 team. With them, he was the runner-up at the 2019 FIFA U-20 World Cup.[4]