Calocaerus (died 334) was a Roman usurper against Emperor Constantine I.
Calocaerus was Magister pecoris camelorum ("Lord of the sheep and camels") in Cyprus. In 333–334 he revolted, proclaiming himself Emperor. Constantine sent his half-brother, the Censor Flavius Dalmatius to quell the rebellion, and Calocaerus was defeated, and afterwards brought to Tarsus in Cilicia, where he was tried and executed.
- Canduci, Alexander (2010), Triumph & Tragedy: The Rise and Fall of Rome's Immortal Emperors, Pier 9, ISBN 978-1-74196-598-8
- Arnold Hugh Martin Jones, J. (EDT) Morris, J. R. (John Robert) Martindale, The Prosopography of the Later Roman Empire, Cambridge University Press, 1971, ISBN 0-521-07233-6.
- DiMaio, Michael, "Calocaerus (333/334 A.D.)", De Imperatoribus Romanis