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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 303 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 303 CCCIII |
| Ab urbe condita | 1056 |
| Assyrian calendar | 5053 |
| Balinese saka calendar | 224–225 |
| Bengali calendar | −290 |
| Berber calendar | 1253 |
| Buddhist calendar | 847 |
| Burmese calendar | −335 |
| Byzantine calendar | 5811–5812 |
| Chinese calendar | 壬戌年 (Water Dog) 3000 or 2793 — to — 癸亥年 (Water Pig) 3001 or 2794 |
| Coptic calendar | 19–20 |
| Discordian calendar | 1469 |
| Ethiopian calendar | 295–296 |
| Hebrew calendar | 4063–4064 |
| Hindu calendars | |
| - Vikram Samvat | 359–360 |
| - Shaka Samvat | 224–225 |
| - Kali Yuga | 3403–3404 |
| Holocene calendar | 10303 |
| Iranian calendar | 319 BP – 318 BP |
| Islamic calendar | 329 BH – 328 BH |
| Javanese calendar | 183–184 |
| Julian calendar | 303 CCCIII |
| Korean calendar | 2636 |
| Minguo calendar | 1609 before ROC 民前1609年 |
| Nanakshahi calendar | −1165 |
| Seleucid era | 614/615 AG |
| Thai solar calendar | 845–846 |
| Tibetan calendar | 阳水狗年 (male Water-Dog) 429 or 48 or −724 — to — 阴水猪年 (female Water-Pig) 430 or 49 or −723 |
Year 303 (CCCIII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. It was known in the Roman Empire as the Year of the Consulship of Diocletian and Maximian (or, less frequently, year 1056 Ab urbe condita). The denomination 303 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.