Niusha Carmen Mancilla Heredia (born 19 January 1971 in Cochabamba) is a Bolivian former middle and long-distance runner.
She holds the Bolivian records from 800 metres up to the 15 km road distance, as well as for the 3000 metres steeplechase.
She is a two-time South American silver medallist in the 1500 metres and competed three times at the IAAF World Indoor Championships over that distance.
She won middle distance track medals at the Ibero-American Championships in Athletics at the 2000 and 2002 editions.
At the 2001 Bolivarian Games she won three gold medals and set two national records.
She also represented Bolivia at the 2000 IAAF World Cross Country Championships and the 2003 Pan American Games.