|Millennium:||1st millennium BC|
|Centuries:||2nd century BC – 1st century BC – 1st century|
|Decades:||60s BC 50s BC 40s BC – 30s BC – 20s BC 10s BC 0s BC|
|Years:||33 BC 32 BC 31 BC – 30 BC – 29 BC 28 BC 27 BC|
|Gregorian calendar||30 BC|
|Ab urbe condita||724|
|Ancient Egypt era||XXXIII dynasty, 294|
|- Pharaoh||Cleopatra VII, 22|
|Ancient Greek era||187th Olympiad, year 3|
|Balinese saka calendar||N/A|
|Chinese calendar||庚寅年 (Metal Tiger)|
2667 or 2607
— to —
辛卯年 (Metal Rabbit)
2668 or 2608
|Coptic calendar||−313 – −312|
|Ethiopian calendar||−37 – −36|
|- Vikram Samvat||27–28|
|- Shaka Samvat||N/A|
|- Kali Yuga||3071–3072|
|Iranian calendar||651 BP – 650 BP|
|Islamic calendar||671 BH – 670 BH|
|Julian calendar||30 BC|
|Minguo calendar||1941 before ROC|
|Seleucid era||282/283 AG|
|Thai solar calendar||513–514|
97 or −284 or −1056
— to —
98 or −283 or −1055
- Gaius Julius Caesar Octavian becomes Roman Consul for the fourth time. His partner is Marcus Licinius Crassus the Younger.
- Octavian leads his army to the Dardanelles. He marches into Syria. Herod the Great sends him vows of loyalty and troops to help.
- Gaius Cornelius Gallus arrives in Cyrene and occupies Paraetonium.
- Mark Antony retreats with his army to Egypt. He learns that Pelusium opened its gates to Octavian without resistance.
- Octavian Caesar captures Alexandria. This marks the official annexation of Ancient Egypt to the Roman Republic.
- Cleopatra evacuates to Berenice on the west coast of the Red Sea. King Malchus of Nabatea attacks from the desert and burns the Egyptian ships.
- The children of Cleopatra are spared by Octavian. Octavia Minor raises Alexander Helios, Cleopatra Selene and Ptolemy Philadelphus in her house in Rome.
- for more information, see Category:30 BC deaths.
- Mark Antony, Roman consul and general (b. 83 BC)
- Marcus Antonius Antyllus, son of Mark Antony and Fulvia (b. 47 BC)
- Hyrcanus II, king and high priest of Judea until 40 BC
- August 12 – Cleopatra VII, last queen of Ptolemaic Egypt (b. 69 BC)
- August 23 – Ptolemy Caesar, son of Julius Caesar and pharaoh of Egypt (b. 47 BC)