Marion Fiack (born 13 October 1992 in Reims) is a French athlete, a specialist in the Pole vault.

[3] First coached by Joël Mertz at Thionville, she won her first cap for France in 2009, at the European Youth Olympic Festival at Tampere.

On 18 January 2014 at Orleans, Marion Fiack vaulted 4.61 m, improving the French Under 23 record, and temporarily seizing the best world performance of the year tied with the British Holly Bradshaw.

[11] She continued, outdoors, with a victory at Pézenas in late May by vaulting 4.55 m.[12] At the French championships she took second place, beaten by Vanessa Boslak.

At the European Championships from Zurich, she failed to reach the final, having to settle for 4.35 m. On 10 January 2015 at Aubière, she improved 10 cm to clear 4.71 m.[13] This thus beats the France record formerly held by Vanessa Boslak (4.70 m since 28 June 2006)[14] and seized temporarily the best world performance of the year.