Anouska Helena Koster is a Dutch professional racing cyclist, who currently rides for UCI Women's Continental Team Visma–Lease a Bike.

The 2017 Boels Rental Ladies Tour also known as the 2017 Holland Ladies Tour is the 20th edition of the Holland Ladies Tour, a women's cycle stage race held in the Netherlands. The tour is part of the 2017 women's road cycling calendar and is part of the UCI Women's World Tour.