Tertius

Tertius may refer to:

People

 * Tertius of Iconium, first century Christian martyr, saint and bishop
 * Tertius, fifth century Christian martyr and saint (see Denise, Dativa, Leontia, Tertius, Emilianus, Boniface, Majoricus, and Servus)
 * Tertius Bosch (1966-2000), South African cricketer
 * Tertius Chandler (1915-2000) American historian and author
 * Tertius Delport, South African politician
 * Tertius Losper (born 1985), Namibian rugby union fullback
 * T. Tertius Noble (1867-1953), English-born organist and composer
 * Tertius Zongo (born 1957), former Prime Minister of Burkina Faso

Other uses

 * Tertius (law), a term in contract law referring to an interested third party
 * Tertius, transcriber of the Epistle to the Romans
 * Tertius, the underworld of Pluto (mythology)
 * Tertius Lydgate, a main character in George Eliot's novel Middlemarch
 * Tertius, a planet in Robert A . Heinlein's science fiction novel Time Enough for Love and subsequent books featuring Lazarus Long
 * Tertius (sandbank), a German sandbank in Meldorf Bay