| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 110s BC 100s BC 90s BC – 80s BC – 70s BC 60s BC 50s BC |
| Years: | 87 BC 86 BC 85 BC – 84 BC – 83 BC 82 BC 81 BC |
| 84 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 84 BC |
| Ab urbe condita | 670 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1927 – -1926 |
| Bengali calendar | -676 |
| Berber calendar | 867 |
| Buddhist calendar | 461 |
| Burmese calendar | -721 |
| Byzantine calendar | 5425 – 5426 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2553/2613) — to —
[[Sexagenary cycle|]]年(2554/2614) |
| Coptic calendar | -367 – -366 |
| Ethiopian calendar | -91 – -90 |
| Hebrew calendar | 3677 – 3678 |
| Hindu calendars | |
| - Bikram Samwat | -27 – -26 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3018 – 3019 |
| Holocene calendar | 9917 |
| Iranian calendar | 705 BP – 704 BP |
| Islamic calendar | 727 BH – 726 BH |
| Japanese calendar | |
| Korean calendar | 2250 |
| Thai solar calendar | 460 |
Year 84 BC was a year of the pre-Julian calendar.