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.

Millennium: 1st millennium
Centuries: 3rd century4th century5th century
Decades: 270s  280s  290s  – 300s –  310s  320s  330s
Years: 300 301 302303304 305 306
303 in other calendars
Gregorian calendar303
CCCIII
Ab urbe condita1056
Assyrian calendar5053
Balinese saka calendar224–225
Bengali calendar−290
Berber calendar1253
Buddhist calendar847
Burmese calendar−335
Byzantine calendar5811–5812
Chinese calendar壬戌(Water Dog)
2999 or 2939
    — to —
癸亥年 (Water Pig)
3000 or 2940
Coptic calendar19–20
Discordian calendar1469
Ethiopian calendar295–296
Hebrew calendar4063–4064
Hindu calendars
 - Vikram Samvat359–360
 - Shaka Samvat224–225
 - Kali Yuga3403–3404
Holocene calendar10303
Iranian calendar319 BP – 318 BP
Islamic calendar329 BH – 328 BH
Javanese calendar183–184
Julian calendar303
CCCIII
Korean calendar2636
Minguo calendar1609 before ROC
民前1609年
Nanakshahi calendar−1165
Seleucid era614/615 AG
Thai solar calendar845–846
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

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