1303
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1303 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1303 in poetry | 
| Gregorian calendar | 1303 MCCCIII | 
| Ab urbe condita | 2056 | 
| Armenian calendar | 752 ԹՎ ՉԾԲ | 
| Assyrian calendar | 6053 | 
| Balinese saka calendar | 1224–1225 | 
| Bengali calendar | 709–710 | 
| Berber calendar | 2253 | 
| English Regnal year | 31 Edw. 1 – 32 Edw. 1 | 
| Buddhist calendar | 1847 | 
| Burmese calendar | 665 | 
| Byzantine calendar | 6811–6812 | 
| Chinese calendar | 壬寅年 (Water Tiger) 4000 or 3793 — to — 癸卯年 (Water Rabbit) 4001 or 3794 | 
| Coptic calendar | 1019–1020 | 
| Discordian calendar | 2469 | 
| Ethiopian calendar | 1295–1296 | 
| Hebrew calendar | 5063–5064 | 
| Hindu calendars | |
| - Vikram Samvat | 1359–1360 | 
| - Shaka Samvat | 1224–1225 | 
| - Kali Yuga | 4403–4404 | 
| Holocene calendar | 11303 | 
| Igbo calendar | 303–304 | 
| Iranian calendar | 681–682 | 
| Islamic calendar | 702–703 | 
| Japanese calendar | Kengen 2 / Kagen 1 (嘉元元年) | 
| Javanese calendar | 1214–1215 | 
| Julian calendar | 1303 MCCCIII | 
| Korean calendar | 3636 | 
| Minguo calendar | 609 before ROC 民前609年 | 
| Nanakshahi calendar | −165 | 
| Thai solar calendar | 1845–1846 | 
| Tibetan calendar | 阳水虎年 (male Water-Tiger) 1429 or 1048 or 276 — to — 阴水兔年 (female Water-Rabbit) 1430 or 1049 or 277 | 
Year 1303 (MCCCIII) was a common year starting on Tuesday of the Julian calendar.