| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC - 1st century BC - 1st century |
| Decades: | 120s BC 110s BC 100s BC - 90s BC - 80s BC 70s BC 60s BC |
| Years: | 93 BC 92 BC 91 BC - 90 BC - 89 BC 88 BC 87 BC |
| 90 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 90 BC |
| Ab urbe condita | 664 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1933 – -1932 |
| Berber calendar | 861 |
| Buddhist calendar | 455 |
| Burmese calendar | -727 |
| Byzantine calendar | 5419 – 5420 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2547/2607) — to —
[[Sexagenary cycle|]]年(2548/2608) |
| Coptic calendar | -373 – -372 |
| Ethiopian calendar | -97 – -96 |
| Hebrew calendar | 3671 – 3672 |
| Hindu calendars | |
| - Vikram Samvat | -34 – -33 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3012 – 3013 |
| Holocene calendar | 9911 |
| Iranian calendar | 711 BP – 710 BP |
| Islamic calendar | 733 BH – 732 BH |
| Japanese calendar | |
| Korean calendar | 2244 |
| Thai solar calendar | 454 |
Year 90 BC was a year of the pre-Julian calendar.
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