Lum Choar (Khmer: លំជ័រ) is a commune in Ou Ya Dav District, Ratanakiri Province, Cambodia.

It contains four villages and has a population of 1,385.

[1] In the 2007 commune council elections, three of the commune's five seats went to the Cambodian People's Party and two went to the Sam Rainsy Party.

[2] The land alienation rates in Lum Choar was moderate as of January 2006.

[3] (See Ratanakiri Province for background information on land alienation.)