|Centuries:||1st century BC – 1st century – 2nd century|
|Decades:||0s 10s 20s – 30s – 40s 50s 60s|
|Years:||36 37 38 – 39 – 40 41 42|
|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
- Tigellinus, minister and favorite of the later Roman emperor Nero, is banished for adultery with Caligula's sisters.
- Domitius Afer becomes a consul.
- Caligula is also a consul.
- Agrippa I, king of Iudaea, is called back to Rome.
- Legio XV Primigenia and XXII Primigenia are levied by Caligula for the German frontier.
- Caligula's campaign into Germany was stopped by a conspiracy led by Cassius Chaerea.
- Caligula orders that a statue of himself be placed in the temple in Jerusalem. Jews protest. They are able to stop construction of the statue until the death of Caligula (January 24, 41).
- Philo leads a Jewish delegation to Rome to protest the anti-Jewish conditions in Alexandria.