990
| Years | 
|---|
| Millennium | 
| 1st millennium | 
| Centuries | 
| Decades | 
| Years | 
| 990 by topic | 
|---|
| Leaders | 
| Categories | 
| 
 | 
| Gregorian calendar | 990 CMXC | 
| Ab urbe condita | 1743 | 
| Armenian calendar | 439 ԹՎ ՆԼԹ | 
| Assyrian calendar | 5740 | 
| Balinese saka calendar | 911–912 | 
| Bengali calendar | 396–397 | 
| Berber calendar | 1940 | 
| Buddhist calendar | 1534 | 
| Burmese calendar | 352 | 
| Byzantine calendar | 6498–6499 | 
| Chinese calendar | 己丑年 (Earth Ox) 3687 or 3480 — to — 庚寅年 (Metal Tiger) 3688 or 3481 | 
| 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 | 
| Tibetan calendar | 阴土牛年 (female Earth-Ox) 1116 or 735 or −37 — to — 阳金虎年 (male Iron-Tiger) 1117 or 736 or −36 | 
Year 990 (CMXC) was a common year starting on Wednesday of the Julian calendar.