903
| Years | 
|---|
| Millennium | 
| 1st millennium | 
| Centuries | 
| Decades | 
| Years | 
| 903 by topic | 
|---|
| Leaders | 
| Categories | 
| 
 | 
| Gregorian calendar | 903 CMIII | 
| Ab urbe condita | 1656 | 
| Armenian calendar | 352 ԹՎ ՅԾԲ | 
| Assyrian calendar | 5653 | 
| Balinese saka calendar | 824–825 | 
| Bengali calendar | 309–310 | 
| Berber calendar | 1853 | 
| Buddhist calendar | 1447 | 
| Burmese calendar | 265 | 
| Byzantine calendar | 6411–6412 | 
| Chinese calendar | 壬戌年 (Water Dog) 3600 or 3393 — to — 癸亥年 (Water Pig) 3601 or 3394 | 
| Coptic calendar | 619–620 | 
| Discordian calendar | 2069 | 
| Ethiopian calendar | 895–896 | 
| Hebrew calendar | 4663–4664 | 
| Hindu calendars | |
| - Vikram Samvat | 959–960 | 
| - Shaka Samvat | 824–825 | 
| - Kali Yuga | 4003–4004 | 
| Holocene calendar | 10903 | 
| Iranian calendar | 281–282 | 
| Islamic calendar | 290–291 | 
| Japanese calendar | Engi 3 (延喜3年) | 
| Javanese calendar | 801–803 | 
| Julian calendar | 903 CMIII | 
| Korean calendar | 3236 | 
| Minguo calendar | 1009 before ROC 民前1009年 | 
| Nanakshahi calendar | −565 | 
| Seleucid era | 1214/1215 AG | 
| Thai solar calendar | 1445–1446 | 
| Tibetan calendar | 阳水狗年 (male Water-Dog) 1029 or 648 or −124 — to — 阴水猪年 (female Water-Pig) 1030 or 649 or −123 | 
Year 903 (CMIII) was a common year starting on Saturday of the Julian calendar.