| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century – 2nd century – 3rd century |
| Decades: | 70s 80s 90s – 100s – 110s 120s 130s |
| Years: | 100 101 102 – 103 – 104 105 106 |
| 103 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 103 CIII |
| Ab urbe condita | 856 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1741 – -1740 |
| Bengali calendar | -490 |
| Berber calendar | 1053 |
| Buddhist calendar | 647 |
| Burmese calendar | -535 |
| Byzantine calendar | 5611 – 5612 |
| Chinese calendar | 壬寅年十二月初六日 (2739/2799-12-6) — to —
癸卯年十一月十五日(2740/2800-11-15) |
| Coptic calendar | -181 – -180 |
| Ethiopian calendar | 95 – 96 |
| Hebrew calendar | 3863 – 3864 |
| Hindu calendars | |
| - Bikram Samwat | 159 – 160 |
| - Shaka Samvat | 25 – 26 |
| - Kali Yuga | 3204 – 3205 |
| Holocene calendar | 10103 |
| Iranian calendar | 519 BP – 518 BP |
| Islamic calendar | 535 BH – 534 BH |
| Japanese calendar | |
| Korean calendar | 2436 |
| Thai solar calendar | 646 |
Year 103 (CIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.