| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 170s 180s 190s – 200s – 210s 220s 230s |
| Years: | 200 201 202 – 203 – 204 205 206 |
| 203 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 203 CCIII |
| Ab urbe condita | 956 |
| Armenian calendar | N/A |
| Assyrian calendar | 4953 |
| Bahá'í calendar | -1641–-1640 |
| Bengali calendar | -390 |
| Berber calendar | 1153 |
| English Regnal year | N/A |
| Buddhist calendar | 747 |
| Burmese calendar | -435 |
| Byzantine calendar | 5711–5712 |
| Chinese calendar | 壬午年十二月初一日 (2839/2899-12-1) — to —
癸未年十一月十一日(2840/2900-11-11) |
| Coptic calendar | -81–-80 |
| Ethiopian calendar | 195–196 |
| Hebrew calendar | 3963–3964 |
| Hindu calendars | |
| - Vikram Samvat | 259–260 |
| - Shaka Samvat | 125–126 |
| - Kali Yuga | 3304–3305 |
| Holocene calendar | 10203 |
| Iranian calendar | 419 BP – 418 BP |
| Islamic calendar | 432 BH – 431 BH |
| Japanese calendar | |
| Korean calendar | 2536 |
| Minguo calendar | 1709 before ROC 民前1709年 |
| Thai solar calendar | 746 |
Year 203 (CCIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Plautianus and Geta (or, less frequently, year 956 Ab urbe condita). The denomination 203 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.