Two new species of Begonia L. ( Begoniaceae ), B. laotica (sect. Parvibegonia ) and B. hypoleuca (sect. Reichenheimia ), from north Laos are described and illustrated. Begonia augustinei , B. dryadis , B. lancangensis , B. sizemoreae and B. sillentensis subsp. mengyangensis were newly recorded taxa in Laos. Furthermore, an updated checklist of Begonia of Laos is also compiled.