Lebiasina is a genus of freshwater ray-finned fish belonging to the family Lebiasinidae, the pencifishes, splashing tetras and related fishes. The fishes in this genus are found in the Neotropics, where they inhabit well-oxygenated upland streams that originate in the Andes of Colombia, Ecuador and Peru, the Guianan Highlands in Brazil, Guyana and Venezuela, and Serra do Cachimbo in Brazil, as well as in southern Central America. The individual species tend to have relatively small ranges and the three species of Serra do Cachimbo, all restricted to the Curuá River basin, are considered threatened by Brazil's Ministry of the Environment.

They are elongated fish that reach up to 16 cm (6.3 in) in standard length.

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