Waldemar Frederick Eric Marx (4 July 1895 – 2 June 1974) was a South African cricketer who played in three Tests in 1921.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| Tests | 3 | 125 | 20.83 | 0/0 | 36 | 4 | 36.00 | 3/85 | 0/– |
| First-class | 9 | 656 | 41.00 | 2/1 | 240 | 13 | 30.84 | 3/85 | 2/– |
