Hyloxalus lehmanni is a species of frog in the family Dendrobatidae. It is found widely in Colombia from Antioquia southwards (Cordillera Occidental and Cordillera Central) to northern Ecuador (Cotopaxi Province).
Males measure 15–20 mm (0.59–0.79 in) and females 17–23 mm (0.67–0.91 in) in snout–vent length. Abdomen is black in males but white or gray in females. An oblique lateral stripe that extends to eye is present.
