This dictionary documents the lexicon of the Na language (nɑ˩-ʐwɤ˥) as spoken in and around the plain of Yongning, located in Southwestern China, at the border between Yunnan and Sichuan, at a latitude of 27°50’ N and a longitude of 100°41’ E. This language is known locally as 'Mosuo'. Entries and examples have translations into English and Chinese and French. A Na-Chinese-French version of this dictionary is also available. The dictionary is also available through a web interface: himalco.huma-num.fr/dictionaries/ There are two supplementary files in the present deposit: (i) The file NaDictionary.xml contains the entire database in XML format following the ISO standard LMF: this is a computer-readable format. For technical documentation on this format, see: https://pypi.python.org/pypi/pylmflib/1.0 (ii) The file NaDictionary.txt contains the entire database in SIL's Toolbox format (MDF); this is the source file on which the editing is done.