Celestine (II) (flourished 12th century) was a pope who was elected in December 1124 but resigned a few days later and is not counted in the official list of popes.
After the death of Calixtus II, the rival houses of Frangipani and Pierleoni struggled for the papal throne. The Pierleonis’ candidate, Theobald (who would have been Celestine II), was simultaneously elected pope with the Frangipanis’ candidate, Cardinal Lamberto of Ostia, who became Honorius II. A violent struggle followed the election of Honorius, during which Theobald was wounded and forced to resign.