|Millennium:||1st millennium BC|
|129 BC by topic|
|Gregorian calendar||129 BC|
|Ab urbe condita||625|
|Ancient Egypt era||XXXIII dynasty, 195|
|- Pharaoh||Ptolemy VIII Physcon, 17|
|Ancient Greek era||162nd Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||辛亥年 (Metal Pig)|
2568 or 2508
— to —
壬子年 (Water Rat)
2569 or 2509
|Coptic calendar||−412 – −411|
|Ethiopian calendar||−136 – −135|
|- Vikram Samvat||−72 – −71|
|- Shaka Samvat||N/A|
|- Kali Yuga||2972–2973|
|Iranian calendar||750 BP – 749 BP|
|Islamic calendar||773 BH – 772 BH|
|Minguo calendar||2040 before ROC|
|Seleucid era||183/184 AG|
|Thai solar calendar||414–415|
−2 or −383 or −1155
— to —
−1 or −382 or −1154
Year 129 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Tuditanus and Aquillius (or, less frequently, year 625 Ab urbe condita) and the Sixth Year of Yuanguang. The denomination 129 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.
The Empire of Rome
- The Kingdom of Pergamon becomes the Roman Province of Asia upon the defeat of Aristonicus, pretender to the Attalid throne, by M. Perperna.
- C. Sempronius Tuditanus celebrates his triumph over the Iapydes of Illyria.
- Scipio Aemilianus, victor of Carthage is possibly assassinated by his enemies in Rome.
- Battle of Ecbatana: The Seleucid King Antiochus VII Sidetes is defeated and killed by the Parthians under Phraates II, ending Seleucid control over Media or Mesopotamia.
- Having been freed by the Parthians, Demetrius II of Syria recovers the throne of the Seleucid Empire.
- Hipparchus publishes his catalog of stars.
- Total solar eclipse, used by Hipparchus to estimate distance to the moon.
- Antiochus VII Sidetes (killed in battle)
- Carneades, philosopher, and founder of Third Academy (b. c. 214 BC)
- P. Cornelius Scipio Aemilianus Africanus Numantinus (Africanus the Younger) (b. 185 BC)
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