Errachidia () is a province located in eastern central Morocco in the region of Dra-Tafilalt.
Errachidia is bordered by Algeria to the southeast and by the Moroccan provinces of Figuig to the northeast, Midelt to the north, Tinghir to the west, and Zagora to the southwest. It is considered to be one of the most historically important regions of Morocco.
Errachidia, whose former name is Ksar Souk and Imetãaren in the Berber language, was named in tribute to prince Moulay Rachid.
The province is divided administratively into the following: