|Millennium:||1st millennium BC|
|29 BC by topic|
|Gregorian calendar||29 BC|
|Ab urbe condita||725|
|Ancient Greek era||187th Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||辛卯年 (Metal Rabbit)|
2668 or 2608
— to —
壬辰年 (Water Dragon)
2669 or 2609
|Coptic calendar||−312 – −311|
|Ethiopian calendar||−36 – −35|
|- Vikram Samvat||28–29|
|- Shaka Samvat||N/A|
|- Kali Yuga||3072–3073|
|Iranian calendar||650 BP – 649 BP|
|Islamic calendar||670 BH – 669 BH|
|Julian calendar||29 BC|
|Minguo calendar||1940 before ROC|
|Seleucid era||283/284 AG|
|Thai solar calendar||514–515|
98 or −283 or −1055
— to —
99 or −282 or −1054
Year 29 BC was either a common year starting on Friday or Saturday or a leap year starting on Thursday, 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 leap year starting on Thursday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Octavian and Appuleius (or, less frequently, year 725 Ab urbe condita). The denomination 29 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.
- Octavian Caesar becomes Roman Consul for the fifth time. His partner is Sextus Appuleius. He is granted the title of imperator, and for the third time in Roman history the doors of the Temple of Janus are closed, signalling peace.
- Octavian celebrates, in Rome, three triumphs on consecutive days (August 13, August 14, and August 15) to commemorate his victories in Illyricum, Actium and Egypt.
- Marcus Licinius Crassus campaigns successfully in the Balkans, killing the king of the Bastarnae by his own hand, but is denied the right to dedicate the spolia opima by Octavian.
- Sofia, modern day capital of Bulgaria, is conquered by the Romans and becomes known as Ulpia Serdica.
- Start of the Cantabrian Wars against Roman occupation in Hispania.
- March 1 – Horace writes the ode Occidit Daci Cotisonis agmen.
- Composition of The Aeneid by Virgil begins.
- Antiochus II, Armenian prince of Commagene (executed)
- Mariamne I, wife of Herod the Great (executed) (or 28 BC)
- Ptolemy Philadelphus, Ptolemaic prince of Egypt (b. 36 BC)