大同
大同 may refer to:

Great Unity, a classical Chinese concept for an utopian view of the world

Places
Cities
Datong, a prefecture-level city in Shanxi, China

Counties
Datong County, Shanxi, China

Districts
Datong District, Daqing, Heilongjiang, China
Datong District, Taipei, Taiwan

Towns
Datong, Yilan, Taiwan

Institutions and universities
Shanxi Datong University, in Datong, Shanxi, China
Tatung University, Taipei, Taiwan
Tatung Institute of Commerce and Technology, in Chiayi County, Taiwan
Utopia University, or Datong University, in Shanghai, China

Companies and sport clubs
Datong Coal Mining Group, state-owned coal mining enterprise of China
Datong Coal Industry, a subsidiary and listed company of Datong Coal Mining Group
CRRC Datong, since 2003 'CNR Datong Electric Locomotive Co. Ltd' (DELC), in Datong, Shanxi, China
Tatung Company, Taiwanese electronics company
Tatung F.C., a Taiwanese football club owned by the company

Historical eras
Datong, Chinese era name corresponding to 535 through 546, used by Emperor Wu of Liang
Datong, Chinese era name corresponding to 947, used by Emperor Taizong of Liao
Datong, Chinese era name corresponding to 1224 through 1233, used by Puxian Wannu
Daidō, Japanese era name corresponding to February 1466 through March 1467
Datong, Chinese era name corresponding to 1932 through 1934, used by Puyi as Chief Executive of Manchukuo

Other uses
The Chinese Mayor, original title Datong, documentary film