Luang Por Dattajivo (, ; ; born 21 December 1940), also known by his birth name Phadet Phongsawat () and former ecclesiastical title Phrarajbhavanajahn (, ), is a Thai Buddhist monk. He is the former deputy-abbot of Wat Phra Dhammakaya and the vice-president of the Dhammakaya Foundation, and was the observing abbot of the temple from 1999 until 2006, and again from 2011 until 2016. he was still widely considered the de facto abbot. He met "Mae chi" (nun) Chandra Khonnokyoong and Luang Por Dhammajayo in his student years, and they have been his teachers throughout his life.