339 (CCCXXXIX) was a common year starting on Monday of the Julian calendar, the 339th year of the Common Era (CE) and Anno Domini (AD) designations, the 339th year of the 1st millennium, the 39th year of the 4th century, and the 10th and last year of the 330s decade. As of the start of 339, 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: 300s  310s  320s  – 330s –  340s  350s  360s
Years: 336 337 338339340 341 342
339 in other calendars
Gregorian calendar339
CCCXXXIX
Ab urbe condita1092
Assyrian calendar5089
Balinese saka calendar260–261
Bengali calendar−254
Berber calendar1289
Buddhist calendar883
Burmese calendar−299
Byzantine calendar5847–5848
Chinese calendar戊戌(Earth Dog)
3035 or 2975
    — to —
己亥年 (Earth Pig)
3036 or 2976
Coptic calendar55–56
Discordian calendar1505
Ethiopian calendar331–332
Hebrew calendar4099–4100
Hindu calendars
 - Vikram Samvat395–396
 - Shaka Samvat260–261
 - Kali Yuga3439–3440
Holocene calendar10339
Iranian calendar283 BP – 282 BP
Islamic calendar292 BH – 291 BH
Javanese calendar220–221
Julian calendar339
CCCXXXIX
Korean calendar2672
Minguo calendar1573 before ROC
民前1573年
Nanakshahi calendar−1129
Seleucid era650/651 AG
Thai solar calendar881–882
Tibetan calendar阳土狗年
(male Earth-Dog)
465 or 84 or −688
    — to —
阴土猪年
(female Earth-Pig)
466 or 85 or −687

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Note 1