The largemouth triplefin, Ucla xenogrammus, is a fish of the family Tripterygiidae and only member of the genus Ucla, found in the Pacific Ocean from Viet Nam, the Philippines, Palau and the Caroline Islands to Papua New Guinea, Australia (including Christmas Island), and the Solomon Islands, Fiji, Tonga, east to American Samoa and Rapa, at depths of between 2 and 41 m. Its length is up to about 47 mm.

The largemouth triplefin is found in caves, crevices and on flat surfaces of coral, sponges or rubble with algae.

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