|Millennium:||1st millennium BC|
|149 BC by topic|
|Gregorian calendar||149 BC|
|Ab urbe condita||605|
|Ancient Egypt era||XXXIII dynasty, 175|
|- Pharaoh||Ptolemy VI Philometor, 32|
|Ancient Greek era||157th Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||辛卯年 (Metal Rabbit)|
2548 or 2488
— to —
壬辰年 (Water Dragon)
2549 or 2489
|Coptic calendar||−432 – −431|
|Ethiopian calendar||−156 – −155|
|- Vikram Samvat||−92 – −91|
|- Shaka Samvat||N/A|
|- Kali Yuga||2952–2953|
|Iranian calendar||770 BP – 769 BP|
|Islamic calendar||794 BH – 793 BH|
|Minguo calendar||2060 before ROC|
|Seleucid era||163/164 AG|
|Thai solar calendar||394–395|
−22 or −403 or −1175
— to —
−21 or −402 or −1174
Year 149 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Censorinus and Manilius (or, less frequently, year 605 Ab urbe condita). The denomination 149 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 Third Punic War begins. The Romans land an army in Africa to begin the Battle of Carthage.
- Servius Sulpicius Galba is prosecuted for corruption while serving in Spain, but is acquitted after he parades his weeping family members before the tribunal.
- Lucius Calpurnius Piso passes the lex Calpurnia de repetundis which establishes the first permanent criminal court in Rome.
- The turmoil in Spain escalates again with the renewal of the Lusitanian War, under the leadership of Viriathus, and the Celtiberian War.
- With Roman help, Nicomedes II overthrows his father Prusias II as king of Bithynia.
- Cato the Elder, Roman statesman (b. 234 BC)
- Prusias II, Greek king of Bithynia (b. c. 220 BC)
- ^ Hooker, Richard (June 6, 1999). "Rome: The Punic Wars". Archived from the original on May 28, 2010. Retrieved June 29, 2010.
- ^ "Fourth Macedonian War". Retrieved June 29, 2010.
- ^ "Cato the Elder". Archived from the original on June 12, 2010. Retrieved June 29, 2010.