This article concerns the period 809 BC – 800 BC.
| Millennium | 
|---|
| 1st millennium BC | 
| Centuries | 
| Decades | 
| Years | 
| 
 
 | 
| Categories | 
| Years | 
|---|
| Millennium | 
| 1st millennium BC | 
| Centuries | 
| Decades | 
| Years | 
| 800 BC by topic | 
| Politics | 
|---|
| Categories | 
| Gregorian calendar | 800 BC DCCC BC | 
| Ancient Egypt era | XXIII dynasty, 81 | 
| Ancient Greek Olympiad (summer) | 24 before 1st Olympiad | 
| Assyrian calendar | 3951 | 
| Balinese saka calendar | N/A | 
| Bengali calendar | −1393 – −1392 | 
| Berber calendar | 151 | 
| Buddhist calendar | −255 | 
| Burmese calendar | −1437 | 
| Byzantine calendar | 4709–4710 | 
| Chinese calendar | 庚子年 (Metal  Rat) 1898 or 1691 — to — 辛丑年 (Metal Ox) 1899 or 1692 | 
| Coptic calendar | −1083 – −1082 | 
| Discordian calendar | 367 | 
| Ethiopian calendar | −807 – −806 | 
| Hebrew calendar | 2961–2962 | 
| Hindu calendars | |
| - Vikram Samvat | −743 – −742 | 
| - Shaka Samvat | N/A | 
| - Kali Yuga | 2301–2302 | 
| Holocene calendar | 9201 | 
| Iranian calendar | 1421 BP – 1420 BP | 
| Islamic calendar | 1465 BH – 1464 BH | 
| Javanese calendar | N/A | 
| Julian calendar | N/A | 
| Korean calendar | 1534 | 
| Minguo calendar | 2711 before ROC 民前2711年 | 
| Nanakshahi calendar | −2267 | 
| Thai solar calendar | −257 – −256 | 
| Tibetan calendar | 阳金鼠年 (male Iron-Rat) −673 or −1054 or −1826 — to — 阴金牛年 (female Iron-Ox) −672 or −1053 or −1825 |