Mah Meri is an Aslian (Austroasiatic: Mon-Khmer) language spoken in scattered settlements along a section of the southwest coast of Selangor in Peninsular Malaysia. The Mah Meri are the only Aslian speakers who live in a coastal environment. Their language, which may have about 2,000 speakers, has no written language and is highly endangered.This is the first comprehensive dictionary of Mah Meri and is based on the author's extensive field research and consultation with members of the community over the last ten years. The dialect presented here is spoken by about 600 people at Bukit Bangkong, the most southerly Mah Meri settlement. The dictionary contains around 4,000 entries, each with a phonetic transcription and translations in both English and Malay. Many entries are further complemented by illustrative examples, notes on usage, derivations, ethnographic information, and illustrations-all provide insight into the world of Mah Meri speakers. Two finder lists (English-Mah Meri and Malay-Mah Meri) are included, giving access to the intended audience of international and local scholars and community members. The volume also includes a general introduction to the Mah Meri, notes to assist the reader in using the dictionary, and a short grammatical description.