A revision of Monotropaceae in 2000 for the Flora of Thailand recorded a single species, Monotropa hypopitys L. Based on molecular and morphological findings, Monotropaceae was later included in Ericaceae as subfamily Monotropoideae. In this paper, two genera and three species are recognised in Thailand. Cheilotheca Hook. f. is a new genus record for Thailand, while Cheilotheca crocea L. Wu & Yan Liu and M. uniflora L. are new national records. An updated identification key to genera and species of Monotropoideae in Thailand, together with descriptions and illustrations of thegenus and new record species, are provided.