| Birth Name: | Willemijn Bos |
| Nationality: | Dutch |
| Birth Date: | 1988 5, df=y |
| Birth Place: | Eelde, Netherlands |
| Height: | 1.81 m |
| Weight: | 69 kg |
| Sport: | Field hockey |
| Coach: | Ageeth Boomgaardt (club) Alyson Annan (national) |
| Club: | Laren |
Willemijn Bos (born 2 May 1988) is a Dutch field hockey defender. In 2011, she was included to the All-Star team by the International Hockey Federation. She was to be selected for the 2012 Summer Olympics but tore her anterior cruciate ligament during a friendly against the United States three days before the Games and had to withdraw. She returned to competitions in March 2013, and won a silver medal at the 2016 Rio Olympics.
Bos took up hockey aged six. She has a degree in law from the University of Utrecht.