(Lochen) Rinchen Zangpo (958–1055), also known as Mahaguru, was a principal lotsawa or translator of Sanskrit Buddhist texts into Tibetan during the second diffusion of Buddhism in Tibet (or the New Translation School or New Mantra School period). He was a student of the famous Indian master, Atisha. His associates included (Locheng) Legpai Sherab. Zangpo's disciple Guge Kyithangpa Yeshepal wrote Zangpo's biography. He is said to have built over one hundred monasteries in Western Tibet, including the famous Tabo Monastery in Spiti, Himachal Pradesh, and Poo in Kinnaur.