1003
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1003 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Gregorian calendar | 1003 MIII | 
| Ab urbe condita | 1756 | 
| Armenian calendar | 452 ԹՎ ՆԾԲ | 
| Assyrian calendar | 5753 | 
| Balinese saka calendar | 924–925 | 
| Bengali calendar | 409–410 | 
| Berber calendar | 1953 | 
| English Regnal year | N/A | 
| Buddhist calendar | 1547 | 
| Burmese calendar | 365 | 
| Byzantine calendar | 6511–6512 | 
| Chinese calendar | 壬寅年 (Water Tiger) 3700 or 3493 — to — 癸卯年 (Water Rabbit) 3701 or 3494 | 
| Coptic calendar | 719–720 | 
| Discordian calendar | 2169 | 
| Ethiopian calendar | 995–996 | 
| Hebrew calendar | 4763–4764 | 
| Hindu calendars | |
| - Vikram Samvat | 1059–1060 | 
| - Shaka Samvat | 924–925 | 
| - Kali Yuga | 4103–4104 | 
| Holocene calendar | 11003 | 
| Igbo calendar | 3–4 | 
| Iranian calendar | 381–382 | 
| Islamic calendar | 393–394 | 
| Japanese calendar | Chōhō 5 (長保5年) | 
| Javanese calendar | 905–906 | 
| Julian calendar | 1003 MIII | 
| Korean calendar | 3336 | 
| Minguo calendar | 909 before ROC 民前909年 | 
| Nanakshahi calendar | −465 | 
| Seleucid era | 1314/1315 AG | 
| Thai solar calendar | 1545–1546 | 
| Tibetan calendar | 阳水虎年 (male Water-Tiger) 1129 or 748 or −24 — to — 阴水兔年 (female Water-Rabbit) 1130 or 749 or −23 | 
Year 1003 (MIII) was a common year starting on Friday of the Julian calendar.