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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| AD 100 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | AD 100 C |
| Ab urbe condita | 853 |
| Assyrian calendar | 4850 |
| Balinese saka calendar | 21–22 |
| Bengali calendar | −493 |
| Berber calendar | 1050 |
| Buddhist calendar | 644 |
| Burmese calendar | −538 |
| Byzantine calendar | 5608–5609 |
| Chinese calendar | 己亥年 (Earth Pig) 2797 or 2590 — to — 庚子年 (Metal Rat) 2798 or 2591 |
| Coptic calendar | −184 – −183 |
| Discordian calendar | 1266 |
| Ethiopian calendar | 92–93 |
| Hebrew calendar | 3860–3861 |
| Hindu calendars | |
| - Vikram Samvat | 156–157 |
| - Shaka Samvat | 21–22 |
| - Kali Yuga | 3200–3201 |
| Holocene calendar | 10100 |
| Iranian calendar | 522 BP – 521 BP |
| Islamic calendar | 538 BH – 537 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 100 C |
| Korean calendar | 2433 |
| Minguo calendar | 1812 before ROC 民前1812年 |
| Nanakshahi calendar | −1368 |
| Seleucid era | 411/412 AG |
| Thai solar calendar | 642–643 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 226 or −155 or −927 — to — 阳金鼠年 (male Iron-Rat) 227 or −154 or −926 |
100 (C) was a leap year starting on Wednesday of the Julian calendar, the 100th year of the Common Era (CE) and Anno Domini (AD) designations, the 100th year of the 1st millennium, the 100th and last year of the 1st century, and the 1st year of the 100s decade. As of the start of 100, the Gregorian calendar was 2 days behind the Julian calendar, which was the dominant calendar of the time.
In the Roman Empire, it was sometimes referred to as year 853 ab urbe condita, i.e., 853 years since the founding of Rome in 753 B.C. The denomination AD 100 for this year has been used since the Early Middle Ages, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
This year saw Pacores, the last king of the Indo-Parthian kingdom, ascend to the throne. In the Americas, the Moche culture developed around this time, and Teotihuacan, a major city at the centre of modern-day Mexico, reached a population of around 60,000–80,000.