1399
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1399 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1399 in poetry | 
| Gregorian calendar | 1399 MCCCXCIX | 
| Ab urbe condita | 2152 | 
| Armenian calendar | 848 ԹՎ ՊԽԸ | 
| Assyrian calendar | 6149 | 
| Balinese saka calendar | 1320–1321 | 
| Bengali calendar | 805–806 | 
| Berber calendar | 2349 | 
| English Regnal year | 22 Ric. 2 – 1 Hen. 4 | 
| Buddhist calendar | 1943 | 
| Burmese calendar | 761 | 
| Byzantine calendar | 6907–6908 | 
| Chinese calendar | 戊寅年 (Earth Tiger) 4096 or 3889 — to — 己卯年 (Earth Rabbit) 4097 or 3890 | 
| Coptic calendar | 1115–1116 | 
| Discordian calendar | 2565 | 
| Ethiopian calendar | 1391–1392 | 
| Hebrew calendar | 5159–5160 | 
| Hindu calendars | |
| - Vikram Samvat | 1455–1456 | 
| - Shaka Samvat | 1320–1321 | 
| - Kali Yuga | 4499–4500 | 
| Holocene calendar | 11399 | 
| Igbo calendar | 399–400 | 
| Iranian calendar | 777–778 | 
| Islamic calendar | 801–802 | 
| Japanese calendar | Ōei 6 (応永6年) | 
| Javanese calendar | 1313–1314 | 
| Julian calendar | 1399 MCCCXCIX | 
| Korean calendar | 3732 | 
| Minguo calendar | 513 before ROC 民前513年 | 
| Nanakshahi calendar | −69 | 
| Thai solar calendar | 1941–1942 | 
| Tibetan calendar | 阳土虎年 (male Earth-Tiger) 1525 or 1144 or 372 — to — 阴土兔年 (female Earth-Rabbit) 1526 or 1145 or 373 | 
Year 1399 (MCCCXCIX) was a common year starting on Wednesday of the Julian calendar.