Omnium (Latin: of all, belonging to all) may refer to:
Omnium, a multiple race event in track cycling in which all contestants compete against each other in six different disciplines. Òmnium Cultural, an association promoting the Catalan language Omnium II, a Thoroughbred racehorse Omnium, a 2005 concept album released by Teatro ZinZanni Omnium, the "fundamental substance of the Universe" in the novel The Third Policeman by Flann O'Brien Omnium, a type of government bond involved in the Great Stock Exchange Fraud of 1814 Omnium, a type of fictional automated robot factory in the game Overwatch (2016 video game)
See also Duke of Omnium, an aristocratic title in the Palliser novels of Anthony Trollope Jacob Omnium, pen name of British writer Matthew James Higgins (1810-1868)