| Marjan op den Velde | |
| Nationality: |  Netherlands |
| Birth Date: | 9 January 1971 |
| Birth Place: | Zaandam, the Netherlands |
| Height: | 1.81m (05.94feet) |
| Weight: | 72kg (159lb) |
| Clubs1: | ZWV Nereus, Zaandam |
| Nationalyears1: | ?-? |
| Nationalteam1: | Netherlands |
Marjan op den Velde (born 9 January 1971) is a Dutch former water polo player. She was a member of the Netherlands women's national water polo team.
She competed with the team at the 2000 Summer Olympics.[1] She was also part of the national team at the 1991 World Aquatics Championship,[2] 1998 World Aquatics Championships, 1999 Women's European Water Polo Championship and 1999 FINA Women's Water Polo World Cup.