521 BC

Millennium:	1st millennium BC
Centuries:	7th century BC – 6th century BC – 5th century BC
Decades:	550s BC  540s BC  530s BC  – 520s BC –  510s BC  500s BC  490s BC
Years:	524 BC 523 BC 522 BC – 521 BC – 520 BC 519 BC 518 BC

521 BC in other calendars

Gregorian calendar	521 BC
Ab urbe condita	233
Ancient Egypt era	XXVII dynasty, 5
- Pharaoh	Darius I of Persia, 1
Ancient Greek era	64th Olympiad, year 4
Assyrian calendar	4230
Bengali calendar	−1113
Berber calendar	430
Buddhist calendar	24
Burmese calendar	−1158
Byzantine calendar	4988–4989
Chinese calendar	己卯年 (Earth Rabbit) 2176 or 2116     — to — 庚辰年 (Metal Dragon) 2177 or 2117
Coptic calendar	−804 – −803
Discordian calendar	646
Ethiopian calendar	−528 – −527
Hebrew calendar	3240–3241
Hindu calendars
- Vikram Samvat	−464 – −463
- Shaka Samvat	N/A
- Kali Yuga	2581–2582
Holocene calendar	9480
Iranian calendar	1142 BP – 1141 BP
Islamic calendar	1177 BH – 1176 BH
Julian calendar	N/A
Korean calendar	1813
Minguo calendar	2432 before ROC 民前2432年
Thai solar calendar	22–23

Events

By place

Persian Empire

• Darius I succeeded Gaumata as ruler of Persia.

Deaths

• March - Cambyses, ruler of ancient Persia (suicide)
• October - Gaumata, ruler of ancient Persia

References