| Years |
|---|
| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 303 by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| 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) 2999 or 2939 — to — 癸亥年 (Water Pig) 3000 or 2940 |
| 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 | ཆུ་ཕོ་ཁྱི་ལོ་ (male Water-Dog) 429 or 48 or −724 — to — ཆུ་མོ་ཕག་ལོ་ (female Water-Boar) 430 or 49 or −723 |
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303 (CCCIII) was a common year starting on Friday of the Julian calendar, the 303rd year of the Common Era (CE) and Anno Domini (AD) designations, the 303rd year of the 1st millennium, the 3rd year of the 4th century, and the 4th year of the 300s decade. As of the start of 303, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.