Celsus may refer to:

• Celsus (or Kelsos, c. 177 AD) an opponent of Christianity quoted by Origen
• Aulus Cornelius Celsus (c. 25 BC – c. 50 AD), an encyclopedist best known for his medical writings
• Aulus Marius Celsus, a Roman senator whose career began under Nero
• Tiberius Julius Celsus Polemaeanus, commonly known as Celsus (ca. 45 – before ca. 120); Roman senator, consul. Ephesus
• Publius Juventius Celsus (AD 67– AD 130), a Roman jurist, praetor, governor, consul
• Tiberius Julius Candidus Marius Celsus, aka Tiberius Julius Candidus; a Roman senator who lived during the Flavian dynasty.
• Saint Celsus (aka Celestinus or Cellach of Armagh), 1080–1129 AD); archbishop of Armagh
• Celsus and Marcionilla early Christian martyrs (in the time of Diocletian); Celsus, young son of Marcionilla.
• Celsus, a martyr; see Nazarius and Celsus: bodies discovered by Saint Ambrose.
• Celsus (usurper) (a.k.a. Titus Cornelius Celsus), a fictional Roman usurper, who supposedly rebelled against Gallienus. One of the Thirty Tyrants of Trebellius Pollio
• Library of Celsus

• Celsius (disambiguation)
• Celso (disambiguation)
• Paracelsus

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