Diana Gansky (née Sachse; born 14 December 1963 in Bergen auf Rügen, Bezirk Rostock) is a German track and field athlete.

Gansky won the European Junior Championship as a 17-year-old in 1981, but she needed a few more years before she was able to compete with the already strong discus team of East Germany.

For a long time she trained with Gabriele Reinsch, the world record holder since July 1988 when she threw 76.80 meters.

She studied sports science, and at the time of German reunification she became a self-employed physiotherapist.

Gansky set her personal best (74.08 metres) on 20 June 1987 in Karl-Marx-Stadt; an East German record until 9 July 1988.