621 BC

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
621 BC in various calendars
Gregorian calendar621 BC
DCXXI 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己亥年 (Earth Pig)
2077 or 1870
    — to —
庚子年 (Metal Rat)
2078 or 1871
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

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.