|AD 34 by topic|
|Gregorian calendar||AD 34|
|Ab urbe condita||787|
|Balinese saka calendar||N/A|
|Chinese calendar||癸巳年 (Water Snake)|
2730 or 2670
— to —
甲午年 (Wood Horse)
2731 or 2671
|Coptic calendar||−250 – −249|
|- Vikram Samvat||90–91|
|- Shaka Samvat||N/A|
|- Kali Yuga||3134–3135|
|Iranian calendar||588 BP – 587 BP|
|Islamic calendar||606 BH – 605 BH|
|Julian calendar||AD 34|
|Minguo calendar||1878 before ROC|
|Seleucid era||345/346 AG|
|Thai solar calendar||576–577|
160 or −221 or −993
— to —
161 or −220 or −992
AD 34 (XXXIV) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Persicus and Vitellius (or, less frequently, year 787 Ab urbe condita). The denomination AD 34 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.
- The Roman aqueduct Pont du Gard is constructed, running for 50 km, ending at Nîmes (approximate date).
- Naevius Sutorius Macro gains favour in the Roman Empire by prostituting his wife Ennia Thrasylla to Caligula.
- Saul of Tarsus, on the road to Damascus, is converted to Christianity, and becomes Paul the Apostle.
- Paul the Apostle and Barnabas start preaching the gospel to the Gentiles.
- Rome intervenes in Armenia (AD 34–37).
- The original inhabitants of Dacia revolt against the Sarmatian tribe of Iazyges, who had enslaved them.
- December 4 – Aulus Persius Flaccus, Roman poet (d. AD 62)
- Mariamne, daughter of Herod Agrippa I (approximate date)
- Zhang Daoling, Chinese Taoist master (d. 156)
- Artaxias III, Roman client king of Armenia (b. 13 BC)
- Philip the Tetrarch, Jewish ruler of Batanaea
- Sextia, wife of Mamercus Aemilius Scaurus
- Stephen, Jewish martyr of Christianity (stoned to death)