Legion

Legion may refer to:

Armed forces
Roman Empire
Roman Legion 
List of Roman legions (disambiguation page)
Legionary

United States

Legion of the United States

World War II

33rd Waffen Grenadier Division of the SS Charlemagne (1st French) (French Legion)
Armenian Legion
Condor Legion
Ostlegionen

Foreign Legions
 Foreign legion
 French Foreign Legion
 Spanish Foreign Legion

Other legions
Arab Legion
Black Legion 
British Legion