Richardsonius is a genus of cyprinid fish consisting of two species native to western North America. Commonly known as redside shiners, that term is also used to refer to Richardsonius balteatus specifically. The genus is named after naturalist Sir John Richardson (1787–1865), who described R. balteatus in 1836.
- Richardsonius balteatus (J. Richardson, 1836) (Redside shiner)
- Richardsonius egregius (Girard, 1858) (Lahontan redside)
- "Richardsonius". Integrated Taxonomic Information System. Retrieved 6 June 2006.
- Froese, Rainer, and Daniel Pauly, eds. (2011). Species of Richardsonius in FishBase. August 2011 version.
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