Leptomantis gauni is a species of frog in the family Rhacophoridae. It is endemic to Borneo and is found in Sabah and central Sarawak (Malaysia), Brunei, and north-eastern Kalimantan (Indonesia). The specific name gauni honours Gaun Sureng, a collector for the Sarawak Museum and a companion to Robert F. Inger on field trips when this species was observed. Common names short-nosed tree frog and Inger's flying frog have been coined for it.
Adult males measure 26–30 mm (1.0–1.2 in) and adult females 36–38 mm (1.4–1.5 in) in snout–vent length. The snout is broadly rounded and short. There is a small conical tubercle in middle of uppereyelid. The tympanum is distinct. The finger and the toe tips have well-developed discs. The fingers are partially webbed whereas the toes are almost fully webbed. The dorsal surfaces are light gray with faint, large, dark spots on the back, consisting of at least a dark interscapular spot. There is a characteristic cream-colored or white spot below the eye. The flanks and the ventrum are white. The legs have dark dorsal crossbars, and the anterior and posterior faces of thigh reddish orange. The iris is pale brown, without network.
