Chacas is a district of the province Asunción in the Ancash Region of Peru. Its seat is Chacas.
The Cordillera Blanca traverses the district. Some of the highest peaks of the district are Wallqan and Yanarahu. Other mountains are listed below:
The people in the district are mainly indigenous citizens of Quechua descent. Quechua is the language which the majority of the population (72.01%) learnt to speak in childhood, 26.42% of the residents started speaking Spanish (2007 Peru Census).