| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 100s BC 90s BC 80s BC – 70s BC – 60s BC 50s BC 40s BC |
| Years: | 80 BC 79 BC 78 BC – 77 BC – 76 BC 75 BC 74 BC |
| 77 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 77 BC |
| Ab urbe condita | 677 |
| Armenian calendar | N/A |
| Assyrian calendar | 4674 |
| Bahá'í calendar | -1920–-1919 |
| Bengali calendar | -669 |
| Berber calendar | 874 |
| English Regnal year | N/A |
| Buddhist calendar | 468 |
| Burmese calendar | -714 |
| Byzantine calendar | 5432–5433 |
| Chinese calendar | 癸卯年 (2560/2620) — to —
甲辰年(2561/2621) |
| Coptic calendar | -360–-359 |
| Ethiopian calendar | -84–-83 |
| Hebrew calendar | 3684–3685 |
| Hindu calendars | |
| - Vikram Samvat | -20–-19 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3025–3026 |
| Holocene calendar | 9924 |
| Iranian calendar | 698 BP – 697 BP |
| Islamic calendar | 719 BH – 718 BH |
| Japanese calendar | |
| Korean calendar | 2257 |
| Minguo calendar | 1988 before ROC 民前1988年 |
| Thai solar calendar | 467 |
Year 77 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Brutus and Lepidus (or, less frequently, year 677 Ab urbe condita). The denomination 77 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.