Yanaqucha (Quechua yana black, very dark, qucha lake, "black lake", hispanicized spelling Yanacocha) is a lake in Peru located in Huayllay District, Pasco Province, Pasco Region. It is situated at a height of about . Yanaqucha lies between Waskaqucha in the west and Lake Junin in the east. The lake belongs to the watershed of the Mantaro River.
In 2000 the high Yanaqucha-Pallqan dam was erected at the southeastern end of the lake at , northwest of the village of Pallqan (Palcan). The dam is operated by Electroperu.