Mascha Pijnenborg (born 30 June 1981) is a Dutch retired road racing cyclist.

Pijnenborg began racing at an amateur level in 2006.

In 2008 she was a guest rider with Red Sun Cycling Team at the Tour Cycliste Féminin International de l'Ardèche.

She spent her 2 most successful seasons at Dolmans Landscaping Team, before joining Team Futurumshop.nl–Polaris for the final two years of her career.

Pijnenborg is also a counselor for people living with disabilities.