1503
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1503 by topic | 
|---|
| Arts and science | 
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Works category | 
| 
 | 
| Gregorian calendar | 1503 MDIII | 
| Ab urbe condita | 2256 | 
| Armenian calendar | 952 ԹՎ ՋԾԲ | 
| Assyrian calendar | 6253 | 
| Balinese saka calendar | 1424–1425 | 
| Bengali calendar | 909–910 | 
| Berber calendar | 2453 | 
| English Regnal year | 18 Hen. 7 – 19 Hen. 7 | 
| Buddhist calendar | 2047 | 
| Burmese calendar | 865 | 
| Byzantine calendar | 7011–7012 | 
| Chinese calendar | 壬戌年 (Water Dog) 4200 or 3993 — to — 癸亥年 (Water Pig) 4201 or 3994 | 
| Coptic calendar | 1219–1220 | 
| Discordian calendar | 2669 | 
| Ethiopian calendar | 1495–1496 | 
| Hebrew calendar | 5263–5264 | 
| Hindu calendars | |
| - Vikram Samvat | 1559–1560 | 
| - Shaka Samvat | 1424–1425 | 
| - Kali Yuga | 4603–4604 | 
| Holocene calendar | 11503 | 
| Igbo calendar | 503–504 | 
| Iranian calendar | 881–882 | 
| Islamic calendar | 908–909 | 
| Japanese calendar | Bunki 3 (文亀3年) | 
| Javanese calendar | 1420–1421 | 
| Julian calendar | 1503 MDIII | 
| Korean calendar | 3836 | 
| Minguo calendar | 409 before ROC 民前409年 | 
| Nanakshahi calendar | 35 | 
| Thai solar calendar | 2045–2046 | 
| Tibetan calendar | 阳水狗年 (male Water-Dog) 1629 or 1248 or 476 — to — 阴水猪年 (female Water-Pig) 1630 or 1249 or 477 | 
Year 1503 (MDIII) was a common year starting on Sunday of the Julian calendar.