| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 990 CMXC |
| Ab urbe condita | 1743 |
| Armenian calendar | 439 ԹՎ ՆԼԹ |
| Assyrian calendar | 5740 |
| Bengali calendar | 397 |
| Berber calendar | 1940 |
| Buddhist calendar | 1534 |
| Burmese calendar | 352 |
| Byzantine calendar | 6498–6499 |
| Chinese calendar |
己丑年 (Earth Ox) 3686 or 3626 — to — 庚寅年 (Metal Tiger) 3687 or 3627 |
| Coptic calendar | 706–707 |
| Discordian calendar | 2156 |
| Ethiopian calendar | 982–983 |
| Hebrew calendar | 4750–4751 |
| Hindu calendars | |
| - Vikram Samvat | 1046–1047 |
| - Shaka Samvat | 911–912 |
| - Kali Yuga | 4090–4091 |
| Holocene calendar | 10990 |
| Iranian calendar | 368–369 |
| Islamic calendar | 379–380 |
| Japanese calendar |
Eiso 3 / Shōryaku 1 (正暦元年) |
| Javanese calendar | 891–892 |
| Julian calendar | 990 CMXC |
| Korean calendar | 3323 |
| Minguo calendar | 922 before ROC 民前922年 |
| Nanakshahi calendar | −478 |
| Seleucid era | 1301/1302 AG |
| Thai solar calendar | 1532–1533 |
Year 990 (CMXC) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.