|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:||37 BC 36 BC 35 BC – 34 BC – 33 BC 32 BC 31 BC|
|34 BC by topic|
|Gregorian calendar||34 BC|
|Ab urbe condita||720|
|Ancient Egypt era||XXXIII dynasty, 290|
|- Pharaoh||Cleopatra VII, 18|
|Ancient Greek era||186th Olympiad, year 3|
|Chinese calendar||丙戌年 (Fire Dog)
2663 or 2603
— to —
丁亥年 (Fire Pig)
2664 or 2604
|Coptic calendar||−317 – −316|
|Ethiopian calendar||−41 – −40|
|- Vikram Samvat||23–24|
|- Shaka Samvat||N/A|
|- Kali Yuga||3068–3069|
|Iranian calendar||655 BP – 654 BP|
|Islamic calendar||675 BH – 674 BH|
|Julian calendar||34 BC|
|Minguo calendar||1945 before ROC
|Seleucid era||278/279 AG|
|Thai solar calendar||509–510|
|Wikimedia Commons has media related to 34 BC.|
Year 34 BC was either a common year starting on Friday, Saturday or Sunday or a leap year starting on Friday or Saturday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Friday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Antonius and Libo (or, less frequently, year 720 Ab urbe condita). The denomination 34 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 pacified Dalmatia and Pannonia forming the province of Illyricum, while Antony regained Armenia from Parthia. Octavian reduces the outposts defending the Liburnian town of Promona, sets up siege works and forces its surrender.
- Mark Antony becomes Roman Consul for the second time. His partner is Lucius Scribonius Libo. The latter is replaced with Aemilius Lepidus Paullus during the year.
- Antony advances into Armenia with an expeditionary force (16 legions) and marches to the capital Artaxata. He arrests king Artavasdes II and takes him to Alexandria.
- Autumn – The Donations of Alexandria: Antony distributes the eastern kingdoms as a gift to the children of Cleopatra VII of Egypt; he declared Caesarion, Caesar's legitimate son as co-ruler of Egypt and Cyprus. Alexander Helios received Armenia and Media, to Cleopatra Selene he gives the kingdoms of Cyrenaica and Libya. His youngest son Ptolemy Philadelphus received the Egyptian possessions in Phoenicia, Syria and Cilicia. Antony established Cleopatra as a Hellenistic monarch at Alexandria and gives her the title of "Queen of Kings".