The year 621 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 133 Ab urbe condita . The denomination 621 BC 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.

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
621 BC in various calendars
Gregorian calendar621 BC
DCXX BC
Ab urbe condita133
Ancient Egypt eraXXVI dynasty, 44
- PharaohPsamtik I, 44
Ancient Greek era39th Olympiad, year 4
Assyrian calendar4130
Balinese saka calendarN/A
Bengali calendar−1213
Berber calendar330
Buddhist calendar−76
Burmese calendar−1258
Byzantine calendar4888–4889
Chinese calendar己亥(Earth Pig)
2076 or 2016
    — to —
庚子年 (Metal Rat)
2077 or 2017
Coptic calendar−904 – −903
Discordian calendar546
Ethiopian calendar−628 – −627
Hebrew calendar3140–3141
Hindu calendars
 - Vikram Samvat−564 – −563
 - Shaka SamvatN/A
 - Kali Yuga2480–2481
Holocene calendar9380
Iranian calendar1242 BP – 1241 BP
Islamic calendar1280 BH – 1279 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1713
Minguo calendar2532 before ROC
民前2532年
Nanakshahi calendar−2088
Thai solar calendar−78 – −77
Tibetan calendar阴土猪年
(female Earth-Pig)
−494 or −875 or −1647
    — to —
阳金鼠年
(male Iron-Rat)
−493 or −874 or −1646

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