| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 3rd century BC – 2nd century BC – 1st century BC |
| Decades: | 150s BC 140s BC 130s BC – 120s BC – 110s BC 100s BC 90s BC |
| Years: | 124 BC 123 BC 122 BC – 121 BC – 120 BC 119 BC 118 BC |
| 121 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 121 BC |
| Ab urbe condita | 633 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1964 – -1963 |
| Bengali calendar | -713 |
| Berber calendar | 830 |
| Buddhist calendar | 424 |
| Burmese calendar | -758 |
| Byzantine calendar | 5388 – 5389 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2516/2576) — to —
[[Sexagenary cycle|]]年(2517/2577) |
| Coptic calendar | -404 – -403 |
| Ethiopian calendar | -128 – -127 |
| Hebrew calendar | 3640 – 3641 |
| Hindu calendars | |
| - Bikram Samwat | -64 – -63 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2981 – 2982 |
| Holocene calendar | 9880 |
| Iranian calendar | 742 BP – 741 BP |
| Islamic calendar | 765 BH – 764 BH |
| Japanese calendar | |
| Korean calendar | 2213 |
| Thai solar calendar | 423 |