Chimuan (also Chimúan) or Yuncan (Yunga–Puruhá, Yunca–Puruhán) is a hypothetical small extinct language family of northern Peru and Ecuador (inter-Andean valley).

Chimuan is proposed to be consisted of at least three attested languages:

All languages are now extinct.

Campbell (2012) classifies Mochica and Cañar–Puruhá each as separate language families.

Mochica was one of the major languages of pre-Columbian South America. It was documented by Fernando de la Carrera and Middendorff in the seventeenth and nineteenth centuries respectively. It became extinct ca. 1950, although some people remember a few words. Adelaar & Muysken (2004) consider Mochica a language isolate for now.

Cañari and Puruhá are documented with only a few words. These two languages are usually connected with Mochica. However, as their documentation level is so low, it may not be possible to confirm this association. According to Adelaar & Muysken (2004), Jijón y Caamaño's evidence of their relationship is only a single word: Mochica nech "river", Cañari necha; based on similarities with neighboring languages, he finds a Barbacoan connection more likely.

Quingnam, likely the same language as Lengua (Yunga) Pescadora, is sometimes taken to be a dialect of Mochica, but it is effectively unattested, unless a list of numerals discovered in 2010 turns out to be Quingnam or Pescadora as expected. Those numerals are not, however, Mochica.

Yunca-Puruhán (Chimuan) internal classification by Mason (1950):