Onesimus, bishop of Byzantium (a runaway slave and early Christian convert mentioned in the New Testament of the Christian Bible).

Onesimus may also refer to:

• Onesimos (vase painter) (fl ca. 505 – ca. 480 BCE)
• Onesimus (son of Python), Macedonian noble
• Onesimus of Kiev, Christian monk
• Onesimus (Boston slave), Sudanese slave of Puritan minister Cotton Mather
• Onesimos Nesib (ca 1856-1931), translator of the Bible into the Ethiopian Oromo language
• Onesimus "Ness" Edwards (1897-1968), British politician
• Onesimus Ustonson, British manufacturer of fishing tackle
• Onesimus (1882), book by Edwin Abbott Abbott
• Onesimus: A Quest For Freedom (1992), Christian video game

• Dendrolaelaps fageticola
• Dendrolaelaps fallacoides
• Dendrolaelaps fallax
• Dendrolaelaps fossilis
• Dendrolaelaps foveolatus
• Dendrolaelaps geminus
• Dendrolaelaps glareoli
• Dendrolaelaps halaskovae
• Dendrolaelaps harlbutti
• Dendrolaelaps hungaricus
• Dendrolaelaps hunteri
• Dendrolaelaps hurlbutti
• Dendrolaelaps inconstans
• Dendrolaelaps ipidoquadrisetus
• Dendrolaelaps isochetus
• Dendrolaelaps isodentatus
• Dendrolaelaps japanoarmatus
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• Dendrolaelaps kielczewskii
• Dendrolaelaps krantzi
• Dendrolaelaps kribii
• Dendrolaelaps laetus
• Dendrolaelaps langi
• Dendrolaelaps latioroides
• Dendrolaelaps latoarmatus