800
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| Millennium |
| 1st millennium |
| Centuries |
| Decades |
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| 800 by topic |
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| Arts, history, and science |
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| Countries |
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| Lists of leaders |
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| Birth and death categories |
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| Establishments and disestablishments categories |
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| Works category |
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| Gregorian calendar | 800 DCCC |
| Ab urbe condita | 1553 |
| Armenian calendar | 249 ԹՎ ՄԽԹ |
| Assyrian calendar | 5550 |
| Balinese saka calendar | 721–722 |
| Bengali calendar | 207 |
| Berber calendar | 1750 |
| Buddhist calendar | 1344 |
| Burmese calendar | 162 |
| Byzantine calendar | 6308–6309 |
| Chinese calendar | 己卯年 (Earth Rabbit) 3496 or 3436 — to — 庚辰年 (Metal Dragon) 3497 or 3437 |
| Coptic calendar | 516–517 |
| Discordian calendar | 1966 |
| Ethiopian calendar | 792–793 |
| Hebrew calendar | 4560–4561 |
| Hindu calendars | |
| - Vikram Samvat | 856–857 |
| - Shaka Samvat | 721–722 |
| - Kali Yuga | 3900–3901 |
| Holocene calendar | 10800 |
| Iranian calendar | 178–179 |
| Islamic calendar | 183–184 |
| Japanese calendar | Enryaku 19 (延暦１９年) |
| Javanese calendar | 695–696 |
| Julian calendar | 800 DCCC |
| Korean calendar | 3133 |
| Minguo calendar | 1112 before ROC 民前1112年 |
| Nanakshahi calendar | −668 |
| Seleucid era | 1111/1112 AG |
| Thai solar calendar | 1342–1343 |
| Tibetan calendar | ས་མོ་ཡོས་ལོ་ (female Earth-Hare) 926 or 545 or −227 — to — ལྕགས་ཕོ་འབྲུག་ལོ་ (male Iron-Dragon) 927 or 546 or −226 |
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800 (DCCC) was a leap year starting on Wednesday of the Julian calendar, the 800th year of the Common Era (CE) and Anno Domini (AD) designations, the 800th year of the 1st millennium, the 100th and last year of the 8th century, and the 1st year of the 800s decade. As of the start of 800, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.