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|AD 39 by topic|
|Gregorian calendar||AD 39
|Ab urbe condita||792|
|Balinese saka calendar||N/A|
|Chinese calendar||戊戌年 (Earth Dog)
2735 or 2675
— to —
己亥年 (Earth Pig)
2736 or 2676
|Coptic calendar||−245 – −244|
|- Vikram Samvat||95–96|
|- Shaka Samvat||N/A|
|- Kali Yuga||3139–3140|
|Iranian calendar||583 BP – 582 BP|
|Islamic calendar||601 BH – 600 BH|
|Julian calendar||AD 39
|Minguo calendar||1873 before ROC
|Seleucid era||350/351 AG|
|Thai solar calendar||581–582|
165 or −216 or −988
— to —
166 or −215 or −987
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AD 39 (XXXIX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Corbulo (or, less frequently, year 792 Ab urbe condita). The denomination AD 39 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Tigellinus, minister and favorite of the later Roman emperor Nero, is banished for adultery with Caligula's sisters.
- Gaius Caesar Augustus Germanicus (Caligula) and Gnaeus Domitius Corbulo become Roman consuls.
- Domitius Afer secures a consulship. Caligula orders a floating bridge to be built using ships as pontoons, stretching for two miles from Baiae to the neighboring port of Puteoli.
- Agrippa I, king of Judaea, successfully accuses Herod Antipas, tetrarch of Galilee and Perea, of conspiracy against Caligula. Antipas is exiled and Agrippa receives his territory.
- Legio XV Primigenia and XXII Primigenia are levied by Caligula for the German frontier.
- Caligula's campaign into Germany is stopped by a conspiracy led by Cassius Chaerea. Even though he never even reaches Germany, Caligula proclaims himself victorious and orders a Triumph.
- Caligula orders that a statue of himself be placed in the temple in Jerusalem. The governor of Syria, Publius Petronius, who is responsible for erecting the statue, faces mass demonstrations by Jews of the region and manages to delay construction of the statue until the death of Caligula in AD 41.
- Philo leads a Jewish delegation to Rome to protest the anti-Jewish conditions in Alexandria.
- November 3 – Lucan, Roman poet (d. AD 65)
- December 30 – Titus Flavius, Roman emperor AD 79–81 (d. AD 81)