| Yang Chang-seop | |
| Position: | Pitcher |
| Throws: | Right |
| Bats: | Right |
| Birth Date: | 22 September 1999 |
| Birth Place: | Seoul, South Korea |
| Debutleague: | KBO |
| Debutdate: | March 28 |
| Debutyear: | 2018 |
| Debutteam: | Samsung Lions |
| Finalleague: | KBO |
| Finaldate: | July 23 |
| Finalyear: | 2023 |
| Finalteam: | Samsung Lions |
| Statleague: | KBO |
| Stat1label: | Win–loss record |
| Stat1value: | 10–13 |
| Stat2label: | Earned run average |
| Stat2value: | 6.27 |
| Stat3label: | Strikeouts |
| Stat3value: | 88 |
| Teams: |
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Yang Chang-seop (; born September 22, 1999, in Seoul) is a South Korean former pitcher for the Samsung Lions in the Korea Baseball Organization (KBO).[1]