Ocnus is a genus of sea cucumbers in the family Cucumariidae.
Species The following species are recognised in the genus Ocnus: Ocnus amiculus Cherbonnier, 1988 Ocnus braziliensis (Verrill, 1868) Ocnus brunneus (Forbes in Thompson, 1840) Ocnus capensis (Théel, 1886) Ocnus cataphractus (Sluiter, 1901) Ocnus corbulus (Cherbonnier, 1953) Ocnus cruciformis Thandar in Thandar & Mjobo, 2014 Ocnus cylindricus Semper, 1867 Ocnus diomedeae Pawson, 1976 Ocnus glacialis (Ljungman, 1879) Ocnus lacteus (Forbes & Goodsir, 1839) Ocnus paracorbulus Thandar, Zettler & Arumugam, 2010 Ocnus petiti (Cherbonnier, 1958) Ocnus placominutus Thandar, Zettler & Arumugam, 2010 Ocnus planci (Brandt, 1835) Ocnus pygmaeus Semper, 1867 Ocnus rowei Thandar, 2008 Ocnus tantulus Cherbonnier, 1988 Ocnus vicarius Bell, 1883
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