| Suh Sung-in | |
| Weight: | Super bantamweight |
| Nationality: | South Korean |
| Birth Date: | 18 July 1959 |
| Birth Place: | Seoul, South Korea |
| Style: | Orthodox |
| Total: | 27 |
| Wins: | 22 |
| Ko: | 9 |
| Losses: | 5 |
| Hangul: | 서성인 |
| Rr: | Seo Seongin |
| Mr: | Sŏ Sŏngin |
Suh Sung-in (; born July 18, 1959, in Seoul, South Korea) is a former boxer from South Korea.
In 1984, Suh became the IBF Super Bantamweight champion by beating Bobby Berna via a tenth-round TKO. He defended his title once before losing it to Kim Ji-won by a tenth-round KO in 1985.