ABSTRACT. - Four new species were obtained in the middle Kapuas basin, Borneo, in or near Danau Sentarum Wildlife Reserve. Osteochilus partilineatus, new species, reaches a maximum known size of 54 mm SL and is distinguished from its congeners by having lOII branched dorsal-fin rays, 27-29 scales along lateral line, 12 circumpeduncular scales and a unique colour pattern of 4 dark longitudinal stripes on a yellowish body. Para chela cyanea, new species, reaches a maximum known size of 50 mm SL and is characterized by having 36-38 lateral line scales, 23-26 branched anal-fin rays, a bluish body in life and a dark vertical blotch at caudal-fin base. Rasbora tuberculata, new species, is distinguished by the presence of well developed tubercles on the back, the caudal peduncle, the dorsal fin and the upper caudal-fin lobe and by having a black spot at the tip of the dorsal and anal fins. Betta enisae, new species, is distinguished by the presence of conspicuous broad subdistal black and blue margins in anal and lower caudal fins and alternating black and blue vertical bars on the caudal fin.