Trigonopoma gracile is a species of freshwater ray-finned fish belonging to the family Danionidae.

This species is found in Indonesia and Malaysia.

Differs from all of its congeners by the following combination of characters: lateral line incomplete to absent, perforating 0–6 scales; 29–32 scales along normal course of lateral line; a conspicuous black (bluish black in life) lateral stripe from tip of snout to extremity of median caudal rays; body slender, its depth 4.4-4.8 times in SL (4.0-5.1); caudal peduncle slender than all other Rasbora, its depth 2.3-2.8 times in its length (2.3-3.3); and long and pointed dorsal and anal fins.

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