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.
|Millennium:||1st millennium BC|
|Gregorian calendar||33 BC|
|Ab urbe condita||721|
|Ancient Egypt era||XXXIII dynasty, 291|
|- Pharaoh||Cleopatra VII, 19|
|Ancient Greek era||186th Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||丁亥年 (Fire Pig)|
2664 or 2604
— to —
戊子年 (Earth Rat)
2665 or 2605
|Coptic calendar||−316 – −315|
|Ethiopian calendar||−40 – −39|
|- Vikram Samvat||24–25|
|- Shaka Samvat||N/A|
|- Kali Yuga||3068–3069|
|Iranian calendar||654 BP – 653 BP|
|Islamic calendar||674 BH – 673 BH|
|Julian calendar||33 BC|
|Minguo calendar||1944 before ROC|
|Seleucid era||279/280 AG|
|Thai solar calendar||510–511|
94 or −287 or −1059
— to —
95 or −286 or −1058
- Gaius Julius Caesar Octavian becomes consul for the second time. His partner is Lucius Volcatius Tullus. Octavian delivers, in the Roman Senate, a speech; de summa Republica, in which he subjects the Donations.
- The second term of the Second Triumvirate expires.
- Marcus Vipsanius is self demoted to Aedile, and builds the Aqua Julia, one of the aqueducts on which Rome's water supply depends, as well as cleaning the Cloaca Maxima sewerage system.
- Mark Antony annexes the kingdom of Media and arranges the marriage of his son Alexander Helios with princess Iotapa, the daughter of king Artavasdes I.
- The Kinambroi surrender to Octavian.