| Millennium: | 1st millennium | 
|---|---|
| Centuries: | |
| Decades: | |
| Years: | 
| Gregorian calendar | 939 CMXXXIX | 
| Ab urbe condita | 1692 | 
| Armenian calendar | 388 ԹՎ ՅՁԸ | 
| Assyrian calendar | 5689 | 
| Bengali calendar | 346 | 
| Berber calendar | 1889 | 
| Buddhist calendar | 1483 | 
| Burmese calendar | 301 | 
| Byzantine calendar | 6447–6448 | 
| Chinese calendar | 戊戌年 (Earth Dog) 3635 or 3575 — to — 己亥年 (Earth Pig) 3636 or 3576 | 
| Coptic calendar | 655–656 | 
| Discordian calendar | 2105 | 
| Ethiopian calendar | 931–932 | 
| Hebrew calendar | 4699–4700 | 
| Hindu calendars | |
| - Vikram Samvat | 995–996 | 
| - Shaka Samvat | 860–861 | 
| - Kali Yuga | 4039–4040 | 
| Holocene calendar | 10939 | 
| Iranian calendar | 317–318 | 
| Islamic calendar | 327–328 | 
| Japanese calendar | Tengyō 2 (天慶2年) | 
| Javanese calendar | 839–840 | 
| Julian calendar | 939 CMXXXIX | 
| Korean calendar | 3272 | 
| Minguo calendar | 973 before ROC 民前973年 | 
| Nanakshahi calendar | −529 | 
| Seleucid era | 1250/1251 AG | 
| Thai solar calendar | 1481–1482 | 
Year 939 (CMXXXIX) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.