644 BC

Millennium:	1st millennium BC
Centuries:	8th century BC – 7th century BC – 6th century BC
Decades:	670s BC  660s BC  650s BC  – 640s BC –  630s BC  620s BC  610s BC
Years:	647 BC 646 BC 645 BC – 644 BC – 643 BC 642 BC 641 BC

644 BC in other calendars

Gregorian calendar	644 BC DCXLIII BC
Ab urbe condita	110
Ancient Egypt era	XXVI dynasty, 21
- Pharaoh	Psamtik I, 21
Ancient Greek era	34th Olympiad (victor)¹
Assyrian calendar	4107
Bengali calendar	−1236
Berber calendar	307
Buddhist calendar	−99
Burmese calendar	−1281
Byzantine calendar	4865–4866
Chinese calendar	丙子年 (Fire Rat) 2053 or 1993     — to — 丁丑年 (Fire Ox) 2054 or 1994
Coptic calendar	−927 – −926
Discordian calendar	523
Ethiopian calendar	−651 – −650
Hebrew calendar	3117–3118
Hindu calendars
- Vikram Samvat	−587 – −586
- Shaka Samvat	N/A
- Kali Yuga	2458–2459
Holocene calendar	9357
Iranian calendar	1265 BP – 1264 BP
Islamic calendar	1304 BH – 1303 BH
Julian calendar	N/A
Korean calendar	1690
Minguo calendar	2555 before ROC 民前2555年
Thai solar calendar	−101 – −100

Deaths

• Bao Shuya, prominent official under Duke Huan of Qi