1403
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1403 by topic | 
|---|
| Arts and science | 
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1403 in poetry | 
| Gregorian calendar | 1403 MCDIII | 
| Ab urbe condita | 2156 | 
| Armenian calendar | 852 ԹՎ ՊԾԲ | 
| Assyrian calendar | 6153 | 
| Balinese saka calendar | 1324–1325 | 
| Bengali calendar | 809–810 | 
| Berber calendar | 2353 | 
| English Regnal year | 4 Hen. 4 – 5 Hen. 4 | 
| Buddhist calendar | 1947 | 
| Burmese calendar | 765 | 
| Byzantine calendar | 6911–6912 | 
| Chinese calendar | 壬午年 (Water Horse) 4100 or 3893 — to — 癸未年 (Water Goat) 4101 or 3894 | 
| Coptic calendar | 1119–1120 | 
| Discordian calendar | 2569 | 
| Ethiopian calendar | 1395–1396 | 
| Hebrew calendar | 5163–5164 | 
| Hindu calendars | |
| - Vikram Samvat | 1459–1460 | 
| - Shaka Samvat | 1324–1325 | 
| - Kali Yuga | 4503–4504 | 
| Holocene calendar | 11403 | 
| Igbo calendar | 403–404 | 
| Iranian calendar | 781–782 | 
| Islamic calendar | 805–806 | 
| Japanese calendar | Ōei 10 (応永10年) | 
| Javanese calendar | 1317–1318 | 
| Julian calendar | 1403 MCDIII | 
| Korean calendar | 3736 | 
| Minguo calendar | 509 before ROC 民前509年 | 
| Nanakshahi calendar | −65 | 
| Thai solar calendar | 1945–1946 | 
| Tibetan calendar | 阳水马年 (male Water-Horse) 1529 or 1148 or 376 — to — 阴水羊年 (female Water-Goat) 1530 or 1149 or 377 | 
Year 1403 (MCDIII) was a common year starting on Monday of the Julian calendar.