Teja Gregorin (born 29 June 1980 in Ljubljana, SFR Yugoslavia) is a retired Slovenian biathlete.

[1] She was a member of the Slovenian biathlon team from 2002 to 2017, having been a cross-country skier before that.

[2] At the 2012 World Championships, Gregorin won the silver medal at the mixed relay, together with Andreja Mali, Klemen Bauer and Jakov Fak.

[3] The Slovenian biathlete was the only competitor who failed the 2017 doping retests from the 2010 Winter Olympics.

In October 2017, the International Biathlon Union said that two samples given by Teja Gregorin tested positive for GHRP-2, a banned substance which stimulates the body to produce more growth hormone, in samples taken the week before competition started.