A study of litter production was conducted at Siar Beach, mangrove forest, near Lundu, Sarawak. There arenine species of trees in this forest of which Rhizophora mucronata is the dominant and R. apiculata is theco-dominant species. The rate of litter production xoas 5.72 t/ha/year, and of this 4.49 t/ha/year (78.5%)was leaf litter. 'The production of litter fluctuates being higher during April to June and December to Februarycompared to other months.