| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| AD 20 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | AD 20 XX |
| Ab urbe condita | 773 |
| Assyrian calendar | 4770 |
| Balinese saka calendar | N/A |
| Bengali calendar | −573 |
| Berber calendar | 970 |
| Buddhist calendar | 564 |
| Burmese calendar | −618 |
| Byzantine calendar | 5528–5529 |
| Chinese calendar | 己卯年 (Earth Rabbit) 2717 or 2510 — to — 庚辰年 (Metal Dragon) 2718 or 2511 |
| Coptic calendar | −264 – −263 |
| Discordian calendar | 1186 |
| Ethiopian calendar | 12–13 |
| Hebrew calendar | 3780–3781 |
| Hindu calendars | |
| - Vikram Samvat | 76–77 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3120–3121 |
| Holocene calendar | 10020 |
| Iranian calendar | 602 BP – 601 BP |
| Islamic calendar | 621 BH – 619 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 20 XX |
| Korean calendar | 2353 |
| Minguo calendar | 1892 before ROC 民前1892年 |
| Nanakshahi calendar | −1448 |
| Seleucid era | 331/332 AG |
| Thai solar calendar | 562–563 |
| Tibetan calendar | 阴土兔年 (female Earth-Rabbit) 146 or −235 or −1007 — to — 阳金龙年 (male Iron-Dragon) 147 or −234 or −1006 |
AD 20 (XX) was a leap year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcus Valerius Messalla Barbatus and Cotta (or, less frequently, year 773 Ab urbe condita). The denomination 20 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.