Three new dolabranes, tagalenes G-I (1-3), together with five known analogues (4-8), were isolated from the twigs of the Chinese mangrove, Ceriops tagal. Their structures were determined on the basis of extensive spectroscopic analysis and the comparison with the previous data. Tagalene G (1) is a 16-nordolabrane with a 15-hydroxymethyl scaffold, tagalene H (2) possesses an 18-hydroxymethyl moiety, whereas tagalene I (3) is a further addition to the small group of dolabranes with a rare 4, 18-epoxy ring. Compounds 6-7 were isolated from C. tagal for the first time.