940

940 in various calendars
Gregorian calendar	940; CMXL
Ab urbe condita	1693
Armenian calendar	389; ԹՎ ՅՁԹ
Assyrian calendar	5690
Balinese saka calendar	861–862
Bengali calendar	347
Berber calendar	1890
Buddhist calendar	1484
Burmese calendar	302
Byzantine calendar	6448–6449
Chinese calendar	己亥年 (Earth Pig); 3637 or 3430; — to —; 庚子年 (Metal Rat); 3638 or 3431
Coptic calendar	656–657
Discordian calendar	2106
Ethiopian calendar	932–933
Hebrew calendar	4700–4701
Hindu calendars
- Vikram Samvat	996–997
- Shaka Samvat	861–862
- Kali Yuga	4040–4041
Holocene calendar	10940
Iranian calendar	318–319
Islamic calendar	328–329
Japanese calendar	Tengyō 3; (天慶３年)
Javanese calendar	840–841
Julian calendar	940; CMXL
Korean calendar	3273
Minguo calendar	972 before ROC; 民前972年
Nanakshahi calendar	−528
Seleucid era	1251/1252 AG
Thai solar calendar	1482–1483
Tibetan calendar	阴土猪年; (female Earth-Pig); 1066 or 685 or −87; — to —; 阳金鼠年; (male Iron-Rat); 1067 or 686 or −86

Millennium:	1st millennium
Centuries:	9th century; 10th century ; 11th century;
Decades:	920s; 930s; 940s ; 950s; 960s;
Years:	937; 938; 939; 940 ; 941; 942; 943;

Year 940 (CMXL) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar.

Events

Saadia Gaon compiles his siddur (Jewish prayer book) in Iraq.
Narita-san Temple is founded in Chiba, Japan.
The Liao Dynasty abolishes the requirement that a younger sister replace an older sister who died in marriage.

Oldest known Danish King, Gorm the Old
Beginning of construction of the main forts in Greater Poland: Giecz, Bnin, Ląd, Gniezno, Poznań, Grzybowo^{[disambiguation needed]}. All the forts were constructed rapidly between 939 and 942.