Hatun Luychu, Mountain summit in Urubamba Province, Peru.

Hatun Luychu is a mountain summit in Urubamba Province that rises to 4,400 meters within the Urupampa mountain range. The peak sits in the Cusco Region between the districts of Chinchero and Hayllabamba.

Hatun Luychu is a Quechua name: hatun means big and luychu deer, giving "big deer mountain". Spanish colonial records Hispanicized it as Jatumiuicho and Jatumluicho. The peak reaches about 4,400 metres on the border of the Chinchero and Hayllabamba districts, northeast of Chinchero in Urubamba Province.

The name Hatun Luychu comes from Quechua: hatun, "big", and luychu, "deer", so the mountain is called "big deer". The peak southeast of it is named Wallata Wachana, Quechua for "where the Andean goose is born". Both names are Hispanicized in some records as Jatumiuicho or Jatumluicho and Huallata Huachana.

Hatun Luychu lies on the border of the Chinchero and Hayllabamba districts, northeast of Chinchero in Urubamba Province, Cusco Region. The sources record no trail or climbing route to the summit, so no ascent advice can be given. The peak reaches about 4,400 metres, and the neighbouring mountain to the southeast is Wallata Wachana.

The peak's name is Quechua for "big deer mountain" (hatun = big, luychu = deer), and its Hispanicized forms Jatumiuicho and Jatumluicho appear on older maps. Southeast of Hatun Luychu rises a companion summit called Wallata Wachana, Quechua for "where the Andean goose is born" (Huallata Huachana in Spanish spelling).