A war flag (or military flag) is a variant of a national flag for use by the nation's military forces on land. (The nautical equivalent is a naval ensign.) Under this strict sense of the term, few nations currently have war flags, most preferring to use instead their state flag or standard national flag for this purpose. More broadly, any flag used by armed forces to represent themselves or the nation they serve can be considered a war or military flag.
Land only War Flags 
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- War Flag of Bolivia
- War Flag of Brunei
- War Flag of the People's Republic of China
- War Flag of the Republic of China
- War Flag of Hungary
- War Flag of Japan
- War Flag of Portugal
- War Flag of the United Kingdom (note 3:5 Ratio)
War Flags which are also Naval Ensigns 
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- War Flag and Navel Ensign of Finland
- War Flag and Navel Ensign of Peru
- War Flag and Navel Ensign of Serbia(note the obverse and reverse are different)
- War Flag and Navel Ensign of Sweden
Other War Flags[]
- State and War Flag and State Ensign of Denmark
- State and War Flag and State Ensign of Germany
- State/War Flag and State/Naval Ensign of Iceland
- State/War Flag and State/Naval Ensign of Norway
- Flag of the Phillipines at War
- Bulgarian War Flag
Historical War Flags[]
- Battle Flag of the Confederate States of America (1861-1865)
- Cross of Burgundy Flag (1506-1843)
- War Flag of East Germany (1960-1990)
- Reichskriegsflagge war flag of the German Wehrmacht and the flag of the Kriegsmarine, (1935-1945)
- State and War Flag of the Kingdom of Greece (1863-1924 and 1935-1970)
- War Flag of the Italian Socialist Republic (1943-1945)
- War Flag of Prussia (1816)
- War Flag of the Roman Republic (1849)
- Flag of the Red Army
- War Flag of Imperial Japanenese Army