| Nicole Koolhaas | |
| Nationality: | Dutch |
| Birth Date: | 31 January 1991 |
| Birth Place: | Hoorn, Netherlands |
| Height: | 1.98 m |
| Weight: | 77 kg |
| Spike: | 310 cm |
| Block: | 300 cm |
| Position: | Middle blocker |
| Currentclub: | Bartoccini Perugia Volley |
| Years: | 2001–2006 2006–2007 2007–2010 2010–2011 2011–2012 2012–2013 2013–2014 2014–2016 2016– |
| Nationalteam: | Netherlands |
Nicole Koolhaas (born 31 January 1991) is a Dutch volleyball player, who plays as a Center. She was a member of the Women's National Team. She plays for Bartoccini Perugia Volley.
She participated in the 2010 FIVB World Grand Prix, 2010 FIVB Volleyball Women's World Championship, 2014 FIVB World Grand Prix, 2015 Montreux Volley Masters, 2015 FIVB World Grand Prix, 2016 FIVB World Grand Prix,[1] 2017 FIVB Volleyball World Grand Prix,[2] 2017 Montreux Volley Masters, 2017 Women's European Volleyball Championship, and 2018 FIVB Volleyball Women's Nations League.[3]