Major Tours Puck Pieterse (pronounced [pʏk ˈpitərsə]; born 13 May 2002) is a Dutch cyclist specializing in cyclo-cross and mountain biking.

She is the 2024 World mountain bike champion in Cross-country Olympic.

[1] She also became the U23 European cyclo-cross champion in 2020,[2] and at age 20, the Elite Women's National Cyclocross Champion of the Netherlands in 2023.

[3] Pieterse is known for her ability to bunny hop the plank barriers in cyclo-cross races.

[4][5] In March 2020, Pieterse signed with Alpecin–Fenix with the initial focus being on cyclo-cross and mountain biking.