Nymphargus chancas (common name: Peru Cochran frog) is a species of frog in the family Centrolenidae. Until recently it was only known from its type locality in the Lamas Province in Peru; however, it is now known to occur more widely in the northern San Martín Region of Peru, extending into the Cordillera del Cóndor in Zamora-Chinchipe Province, Ecuador.