Carst Jan Posthuma (11 January 1868 – 21 December 1939) was a Dutch cricket player of the late 19th and early 20th centuries. He was a left-handed batsman and left-arm fast bowler.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| First-class | 5 | 45 | 7.50 | 0/0 | 29 | 23 | 15.04 | 7/68 | 1/– |
