Karin Büttner-Janz (née Janz, born 17 February 1952) is a German medical doctor who won world and Olympic gold medals in artistic gymnastics for East Germany.

In a controversial finish, she delivered another gold medal winning performance on the uneven bars at the 1972 Munich Olympics, defeating Olga Korbut on her favourite apparatus.

Most believed she was robbed of the All-Around title, especially as with almost the exact same performances she outscored Tourischeva by a whopping 0.65 of a point (more than a fall) in the event finals 4 routines combined.

[2] Büttner-Janz has an uneven bars element named after her, the Janz Salto, which she first performed in competition at the SV Dynamo Spartakiade in East Berlin, 1971.

She obtained her postdoctoral lecture qualification (habilitation treatise) through her work on the development of an artificial spine disk, known as the Charité Disc.