| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 80s BC 70s BC 60s BC – 50s BC – 40s BC 30s BC 20s BC |
| Years: | 58 BC 57 BC 56 BC – 55 BC – 54 BC 53 BC 52 BC |
| 55 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 55 BC |
| Ab urbe condita | 699 |
| Armenian calendar | N/A |
| Assyrian calendar | 4696 |
| Bahá'í calendar | -1898–-1897 |
| Bengali calendar | -647 |
| Berber calendar | 896 |
| English Regnal year | N/A |
| Buddhist calendar | 490 |
| Burmese calendar | -692 |
| Byzantine calendar | 5454–5455 |
| Chinese calendar | 乙丑年 (2582/2642) — to —
丙寅年(2583/2643) |
| Coptic calendar | -338–-337 |
| Ethiopian calendar | -62–-61 |
| Hebrew calendar | 3706–3707 |
| Hindu calendars | |
| - Vikram Samvat | 2–3 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3047–3048 |
| Holocene calendar | 9946 |
| Iranian calendar | 676 BP – 675 BP |
| Islamic calendar | 697 BH – 696 BH |
| Japanese calendar | |
| Korean calendar | 2279 |
| Minguo calendar | 1966 before ROC 民前1966年 |
| Thai solar calendar | 489 |
Year 55 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Crassus and Pompey (or, less frequently, year 699 Ab urbe condita). The denomination 55 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.