| Centuries: | 7th century - 8th century - 9th century |
| Decades: | 770s 780s 790s - 800s - 810s 820s 830s |
| Years: | 797 798 799 - 800 - 801 802 803 |
| 800 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 800 DCCC |
| Ab urbe condita | 1553 |
| Armenian calendar | 249 ԹՎ ՄԽԹ |
| Bahá'í calendar | -1044 – -1043 |
| Berber calendar | 1750 |
| Buddhist calendar | 1344 |
| Burmese calendar | 162 |
| Byzantine calendar | 6308 – 6309 |
| Chinese calendar | 己卯年十二月初二日 (3436/3496-12-2) — to —
庚辰年十二月十二日(3437/3497-12-12) |
| Coptic calendar | 516 – 517 |
| Ethiopian calendar | 792 – 793 |
| Hebrew calendar | 4560 – 4561 |
| Hindu calendars | |
| - Vikram Samvat | 855 – 856 |
| - Shaka Samvat | 722 – 723 |
| - Kali Yuga | 3901 – 3902 |
| Holocene calendar | 10800 |
| Iranian calendar | 178 – 179 |
| Islamic calendar | 183 – 184 |
| Japanese calendar | |
| Korean calendar | 3133 |
| Thai solar calendar | 1343 |
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