Year 100 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Marius and Flaccus (or, less frequently, year 654 Ab urbe condita) and the First Year of Tianhan.[where?] The denomination 100 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.
| Millennium: | 1st millennium BC |
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| Centuries: | |
| Decades: | |
| Years: |
| 100 BC by topic |
| Politics |
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| Categories |
| Gregorian calendar | 100 BC C BC |
| Ab urbe condita | 654 |
| Ancient Egypt era | XXXIII dynasty, 224 |
| - Pharaoh | Ptolemy X Alexander, 8 |
| Ancient Greek era | 170th Olympiad (victor)¹ |
| Assyrian calendar | 4651 |
| Balinese saka calendar | N/A |
| Bengali calendar | −692 |
| Berber calendar | 851 |
| Buddhist calendar | 445 |
| Burmese calendar | −737 |
| Byzantine calendar | 5409–5410 |
| Chinese calendar | 庚辰年 (Metal Dragon) 2598 or 2391 — to — 辛巳年 (Metal Snake) 2599 or 2392 |
| Coptic calendar | −383 – −382 |
| Discordian calendar | 1067 |
| Ethiopian calendar | −107 – −106 |
| Hebrew calendar | 3661–3662 |
| Hindu calendars | |
| - Vikram Samvat | −43 – −42 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3001–3002 |
| Holocene calendar | 9901 |
| Iranian calendar | 721 BP – 720 BP |
| Islamic calendar | 743 BH – 742 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 2234 |
| Minguo calendar | 2011 before ROC 民前2011年 |
| Nanakshahi calendar | −1567 |
| Seleucid era | 212/213 AG |
| Thai solar calendar | 443–444 |
| Tibetan calendar | 阳金龙年 (male Iron-Dragon) 27 or −354 or −1126 — to — 阴金蛇年 (female Iron-Snake) 28 or −353 or −1125 |
