Karin Prinsloo (born 2 December 1989) is a South African swimmer.

Prinsloo was born in Marble Hall, Limpopo, in 1989 and she attended Ben Viljoen High School in Groblersdal, where she graduated in 2007.

Prinsloo narrowly missed out on the gold medal in the woman's 100 m backstroke, where she was up against African record holder Kirsty Coventry, of Zimbabwe.

[2] Prinsloo struck gold later as part of the women's 4 × 100 m relay team of Natasha de Vos, Roxanne Tammadge and Suzaan van Biljon.

[2] At the 2012 Summer Olympics she finished 20th overall in the heats in the Women's 200 metre freestyle with a time of 1:59.24, and failed to reach the semifinals.