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.
• Rome intervenes in Armenia (AD 34–37).

• The original inhabitants of Dacia revolt against the Sarmatian tribe of Iazyges, who had enslaved them.

• Stephen, one of the original seven deacons of the Christian Church, is martyred for his faith (possible date).
• Saul of Tarsus, on the road to Damascus, is converted to Christianity, and becomes Paul the Apostle (possible date).
• According to one dating scheme, Paul and Barnabas announce in Antioch that they will begin to evangelize the Gentiles.

• 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
• Stephen, Jewish martyr of Christianity (stoned to death)