Oswalt Kolle (2 October 1928 – 24 September 2010) was a German-Dutch sex educator, who became famous during the late 1960s and early 1970s for his numerous pioneering books and films on human sexuality. His work was translated into all major languages, while his films found an audience of 140 million worldwide. In his 1997 book Open to Both Sides he came out as bisexual.
He was awarded the Magnus Hirschfeld Medal in 2000.
Kolle was born on 2 October 1928 in Kiel and grew up in Frankfurt.