盖尔达耶（阿拉伯语：غرداية‎）位于阿尔及利亚中部姆扎卜谷中心，是盖尔达耶省的首府。

Ghardaïa (Arabic: غرداية , Mzab-Berber: Ɣerdayt, Taɣerdayt, ⵜⴰⵖⴻⵔⴷⴰⵢⵜ) is the capital city of Ghardaïa Province, Algeria. The commune of Ghardaïa has a population of 93,423 according to the 2008 census, up from 87,599 in 1998, with an annual growth rate of 0.7%. It is located in northern-central Algeria in the Sahara Desert and lies along the left bank of the Wadi Mzab. The M'zab valley in the Ghardaïa Province (Wilaya) was inscribed under the UNESCO World Heritage List in 1982, as a cultural property evaluated under the criteria II ( for its settlement having an impact on urban planning even to the present century), III (for its Ibadi cultural values), and V (a settlement culture which has prevailed to the present century).