| Years |
|---|
| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 320 by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 320 CCCXX |
| Ab urbe condita | 1073 |
| Assyrian calendar | 5070 |
| Balinese saka calendar | 241–242 |
| Bengali calendar | −273 |
| Berber calendar | 1270 |
| Buddhist calendar | 864 |
| Burmese calendar | −318 |
| Byzantine calendar | 5828–5829 |
| Chinese calendar | 己卯年 (Earth Rabbit) 3016 or 2956 — to — 庚辰年 (Metal Dragon) 3017 or 2957 |
| Coptic calendar | 36–37 |
| Discordian calendar | 1486 |
| Ethiopian calendar | 312–313 |
| Hebrew calendar | 4080–4081 |
| Hindu calendars | |
| - Vikram Samvat | 376–377 |
| - Shaka Samvat | 241–242 |
| - Kali Yuga | 3420–3421 |
| Holocene calendar | 10320 |
| Iranian calendar | 302 BP – 301 BP |
| Islamic calendar | 311 BH – 310 BH |
| Javanese calendar | 201–202 |
| Julian calendar | 320 CCCXX |
| Korean calendar | 2653 |
| Minguo calendar | 1592 before ROC 民前1592年 |
| Nanakshahi calendar | −1148 |
| Seleucid era | 631/632 AG |
| Thai solar calendar | 862–863 |
| Tibetan calendar | ས་མོ་ཡོས་ལོ་ (female Earth-Hare) 446 or 65 or −707 — to — ལྕགས་ཕོ་འབྲུག་ལོ་ (male Iron-Dragon) 447 or 66 or −706 |
320 (CCCXX) was a leap year starting on Friday of the Julian calendar, the 320th year of the Common Era (CE) and Anno Domini (AD) designations, the 320th year of the 1st millennium, the 20th year of the 4th century, and the 1st year of the 320s decade. As of the start of 320, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.
