320 (CCCXX) was a leap year starting on Friday of the Julian calendar, the 320th year of the Common Era (CE) and Anno Domini (AD) designations, the 320th year of the 1st millennium, the 20th year of the 4th century, and the 1st year of the 320s decade. As of the start of 320, 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: 290s  300s  310s  – 320s –  330s  340s  350s
Years: 317 318 319320321 322 323
320 in other calendars
Gregorian calendar320
CCCXX
Ab urbe condita1073
Assyrian calendar5070
Balinese saka calendar241–242
Bengali calendar−273
Berber calendar1270
Buddhist calendar864
Burmese calendar−318
Byzantine calendar5828–5829
Chinese calendar己卯(Earth Rabbit)
3016 or 2956
    — to —
庚辰年 (Metal Dragon)
3017 or 2957
Coptic calendar36–37
Discordian calendar1486
Ethiopian calendar312–313
Hebrew calendar4080–4081
Hindu calendars
 - Vikram Samvat376–377
 - Shaka Samvat241–242
 - Kali Yuga3420–3421
Holocene calendar10320
Iranian calendar302 BP – 301 BP
Islamic calendar311 BH – 310 BH
Javanese calendar201–202
Julian calendar320
CCCXX
Korean calendar2653
Minguo calendar1592 before ROC
民前1592年
Nanakshahi calendar−1148
Seleucid era631/632 AG
Thai solar calendar862–863
Tibetan calendar阴土兔年
(female Earth-Rabbit)
446 or 65 or −707
    — to —
阳金龙年
(male Iron-Dragon)
447 or 66 or −706
The Nydam oak boat at Gottorf Castle, Schleswig, (Germany)

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