Mixobrycon is a monospecific genus of freshwater ray-finned fish belonging to the suborder Characoidei within the order Characiformes, the characins. The only species in the genus is Mixobrycon ribeiroi , a species endemic to Paraguay, where it is found in the Paraguay River basin. This taxon has not been assigned to a particular family within the Characoidei and is considered to be incertae sedis, i.e. its taxonomic affinities are, as yet, unclear.

Named in honor of Alípio de Miranda Ribeiro (1874-1939) a Brazilian ichthyologist-herpetologist.

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