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This article is about the year 940. For the number, see 940 (number).
|Centuries:||9th century – 10th century – 11th century|
|Decades:||910s 920s 930s – 940s – 950s 960s 970s|
|Years:||937 938 939 – 940 – 941 942 943|
|940 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1693|
|Chinese calendar||己亥年 (Earth Pig)
3636 or 3576
— to —
庚子年 (Metal Rat)
3637 or 3577
|- Vikram Samvat||996–997|
|- Shaka Samvat||862–863|
|- Kali Yuga||4041–4042|
|Japanese calendar||Tengyō 3
|Minguo calendar||972 before ROC
|Seleucid era||1251/1252 AG|
|Thai solar calendar||1482–1483|
|Wikimedia Commons has media related to 940.|
- 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.
- Abu'l-Wafa, Iranian mathematician
- Brian Boru, high king of Ireland 172-987
- Géza, fejedelem of the Magyars (approximate date)
- July 20 – Ibn Muqla, Abbasid vizier and calligrapher (b. 885)
- December 25 – Makan ibn Kaki, Dailamite warlord
- ar-Radi (Caliph of Baghdad)
- Taira no Masakado, leader of the Taira Clan