|Millennium:||1st millennium BC|
|33 BC by topic|
|Wikimedia Commons has media related to 33 BC.|
Year 33 BC was either a common year starting on Saturday, Sunday or Monday or a leap year starting on Sunday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Saturday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Octavian and Tullus (or, less frequently, year 721 Ab urbe condita). The denomination 33 BC 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.
- Gaius Julius Caesar Octavian becomes Roman Consul for the second time. His partner is Lucius Volcatius Tullus. Octavian delivered in the Roman Senate a speech, de summa Republica, in which he subjected the Donations.
- The second term of the Second Triumvirate expired.
- Marcus Vipsanius is self demoted to Aedile, built the Aqua Julia, one of the aqueducts on which Rome's water supply depended and cleaned the Cloaca Maxima sewerage system
- Mark Antony annexed the kingdom of Media and arranged the marriage of his son Alexander Helios with princess Iotapa, the daughter of king Artavasdes I.
- The Kinambroi surrendered to Octavian
- Crown Prince Ao ascends the throne as Emperor Cheng of Han