An eminent lay-follower of the Buddha. He once came with five hundred disciples to the Buddha at Isipatana and asked him to give them a lesson which might profit them, for, said he, it is difficult for a householder encumbered with a family and the luxuries of household life to comprehend the Buddha’s teachings in their fullness. The Buddha answers that they should practise the four limbs of Stream-winning (sotāpatti): loyalty to the Buddha, the Dhamma and the Saṅgha, and the cultivation of the virtues of the Noble Ones. Dhammadinna answers that they already possess these limbs. The Buddha then expresses his great satisfaction (S.v.406 ff).

The Commentary (SA.iii.223) says that Dhammadinna was one of seven laymen with followings of five hundred — the others being Visākha, Ugga, Citta, Hatthaka Āḷavaka, and Cūḷa° and Mahā-Anāthapiṇḍika.