| Millennium: | 1st millennium |
|---|---|
| Centuries: | 9th century – 10th century – 11th century |
| Decades: | 960s 970s 980s – 990s – 1000s 1010s 1020s |
| Years: | 996 997 998 – 999 – 1000 1001 1002 |
Year 999 (CMXCIX) was a common year of the Julian Calendar.
| 999 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 999 CMXCIX |
| Ab urbe condita | 1752 |
| Armenian calendar | 448 ԹՎ ՆԽԸ |
| Bahá'í calendar | -845 – -844 |
| Bengali calendar | 406 |
| Berber calendar | 1949 |
| Buddhist calendar | 1543 |
| Burmese calendar | 361 |
| Byzantine calendar | 6507 – 6508 |
| Chinese calendar | 戊戌年十二月十一日 (3635/3695-12-11) — to —
己亥年十一月廿一日(3636/3696-11-21) |
| Coptic calendar | 715 – 716 |
| Ethiopian calendar | 991 – 992 |
| Hebrew calendar | 4759 – 4760 |
| Hindu calendars | |
| - Bikram Samwat | 1055 – 1056 |
| - Shaka Samvat | 921 – 922 |
| - Kali Yuga | 4100 – 4101 |
| Holocene calendar | 10999 |
| Iranian calendar | 377 – 378 |
| Islamic calendar | 389 – 390 |
| Japanese calendar | |
| Korean calendar | 3332 |
| Thai solar calendar | 1542 |