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.
| Millennium: | 1st millennium BC |
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| Gregorian calendar | 149 BC CXLIX BC |
| Ab urbe condita | 605 |
| Ancient Egypt era | XXXIII dynasty, 175 |
| - Pharaoh | Ptolemy VI Philometor, 32 |
| Ancient Greek era | 157th Olympiad, year 4 |
| Assyrian calendar | 4602 |
| Balinese saka calendar | N/A |
| Bengali calendar | −741 |
| Berber calendar | 802 |
| Buddhist calendar | 396 |
| Burmese calendar | −786 |
| Byzantine calendar | 5360–5361 |
| Chinese calendar | 辛卯年 (Metal Rabbit) 2549 or 2342 — to — 壬辰年 (Water Dragon) 2550 or 2343 |
| Coptic calendar | −432 – −431 |
| Discordian calendar | 1018 |
| Ethiopian calendar | −156 – −155 |
| Hebrew calendar | 3612–3613 |
| Hindu calendars | |
| - Vikram Samvat | −92 – −91 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2952–2953 |
| Holocene calendar | 9852 |
| Iranian calendar | 770 BP – 769 BP |
| Islamic calendar | 794 BH – 793 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 2185 |
| Minguo calendar | 2060 before ROC 民前2060年 |
| Nanakshahi calendar | −1616 |
| Seleucid era | 163/164 AG |
| Thai solar calendar | 394–395 |
| Tibetan calendar | 阴金兔年 (female Iron-Rabbit) −22 or −403 or −1175 — to — 阳水龙年 (male Water-Dragon) −21 or −402 or −1174 |
