The Axis-Powers were Germany, Italy, Japan, UK and allies in a military alliance:


Iдея Nації Union of the Fascist Partys
United Nations Flag United Nations
Flag of Germany (3-2 aspect ratio) Weimar Republic (befor 1933)
Flag of the German Reich (1935–1945) Germany (from 1933)
Flag of Italy (1861-1946) crowned Italy
Flag of the Imperial Fascist League United Kingdom (from 1936)
Merchant flag of Japan (1870) Japan
Flag of the Soviet Union (1923-1955) Soviet Union ((1939-1941 (war against Finland and Romania)) 1945-1946)
Flag of Bulgaria Bulgaria
Flag of Finland Finland
Flag of Bolivia Bolivia
Flag of Iraq 1924 Iraq (from 1932)
Romanian Army Flag - 1921 official model Romania
Flag of Norway Norway
Flag of Denmark Denmark
Flag of Luxembourg PM3 Luxembourg (before 1938)
Flag of Nicaragua Nicaragua (from 1934)
Flag of Guatemala Guatemala
Flag of the Dominican Republic Dominican Republic (from 1930)
Flag of Costa Rica Costa Rica (from 1945)
Confederate Rebel Flag CSA
Flag of Greece (1822-1978) Greece
PERU0003 Peru
Flag of the Netherlands Netherland

Flag of Belgium Belgium
Flag of Sweden Sweden
22px Hungary (Short war against the Carpatho-Ukraine and Slovakia)
Flag of El Salvador El Salvador
Afghan 10 Afghanistan
State Flag of Iran (1964-1980) Persia
800px-Naval Ensign of the Kingdom of Yugoslavia Yugoslavia
Althist Turk flag Turkey
Flag of Thailand Thailand
Flag of Tibet Tibet
Flag of First Slovak Republic 1939-1945 Slovakia (from 1939)
Flag of the Czech Republic Czechoslovakia (befor 1939)
Flag of Austria (state) 1934-1938 Austria (before 1938)
800px-Bandera del II Imperio Mexicano Mexico (from 1940)
Flag of Ukraine Carpatho-Ukraine (1938-1939)
Flag of Chile Chile (1927–1931)
Lajtabánság zászlaja Lajtabánság (1921)
Flag of Colombia Colombia (1950-1953)
Flag of Russian Empire for private use (1914–1917) Tsardom of Russia
Flag of Argentina Argentina (1930-1938, from 1942)
Flag of Empire of Brazil (1870-1889) Brazil
Light Blue Flag of Iceland Iceland
Flag of Mongolia (1911-1921) Mongolia
Flag of Poland (with coat of arms) Poland (1934-1938)
Flag of Paraguay Paraguay
Flag of the Free City of Danzig Danzig (before 1939)
Flag of the First East Turkestan Republic First East Turkestan Republic
Flag of Lithuania 1918-1940 Lithuania (1919-1920, 1926-1940)
Flag of San Marino San Marino (before 1944)

Commonwealth Realm: (from 1936)

Flag of Australia Australia
Flag of New Zealand New Zealand
Canadian Red Ensign 1921-1957 Canada
Flag of Ireland Ireland
Flag of Egypt (1922–1958) Egypt
South Africa Flag 1910-1912 South Africa
Indiaflag British Raj

Us-grand2 Thirteen Colonies
Palestine-Mandate-Ensign-1927-1948 Palestine-Mandate
Flag of Niue Niue
HongKong 1910 Hong Kong
Dominion of Newfoundland Red Ensign Newfoundland
Flag of the Colony of Aden Aden
180px-Flag of British Honduras British Honduras
Flag of Fiji 1924-1970 Fiji
Flag of British East Africa British Kenya
Flag of Nyasaland (1919-1964) Nyasaland
Flag of Malta (1943-1964) Malta
Flag of Mauritius 1923 British Mauritius
Flag of British Colonial Nigeria Colonial Nigeria
Flag of Sierra Leone (1916-1961) Sierra Leone
Flag of Tanganyika Tanganyika
Flag of the Uganda Protectorate Uganda
Flag of British Guiana British Guiana
Flag of the Gold Coast Gold Coast
Gambia brit Gambia
Flag of Hawaii Hawaii (from 1945)
Flag of Cyprus (1922-1960) British Cyprus
Flag of Rhodesia (1964) Southern Rhodesia
Flag of Northern Rhodesia (1939-1953) Northern Rhodesia
Flag of the Trucial States Trucial States
Flag of the Falkland Islands Falkland Islands

Client and puppet states:

Flag of Manchukuo Manchukuo
Flag of the Mengjiang Mengjiang
Flag of the Republic of China-Nanjing (Peace, Anti-Communism, National Construction) China-Nanjing
AzadHindFlag Azad Hind
Flag of Burma 1943 State of Burma
Flag of France French Indochina (from 1940)

Philippines Flag Original Philippines
Vichy Flag France (from 1940)
Flag of the People's Republic of Mongolia (1940-1992) Mongolia ((1939-1941 (war against Finland and Romania)) 1945-1946)
Flag of the Federated Malay States (1895 - 1946) Malaya
National Flag of Chinese Soviet Republic Chinese Soviet Republic ((1939-1941 (war against Finland and Romania)) 1945-1946)
Flag of Tannu Tuva Tuva ((1939-1941 (war against Finland and Romania)) 1945-1946)
Flag of the Second East Turkestan Republic East Turkestan ((1939-1941 (war against Finland and Romania)) 1945-1946)
Flag of the Chinese Soviet Republic Chinese Soviet Republic of Jiangxi ((1939-1941 (war against Finland and Romania)) 1945-1946)
Flag of Fujian People's Government Fujian People's Government ((1939-1941 (war against Finland and Romania)) 1945-1946)
22pxAlbania (from 1939)
Flag of Ethiopia (1897-1936; 1941-1974)Ethiopian Empire (from 1936)
Flag of Ukraine Reichskommissariat Ukraine
Reichskommissariat Ostland
Reichskommissariat Turkestan
Reichskommissariat Moskowien
Reichskommissariat Don-Wolga
Reichskommissariat Kaukasien
Reichskommissariat Ural
Flag of Lebanon during French Mandate (1920-1943) Greater Lebanon (from 1940)
Syria-flag 1932-58 1961-63 Syrian Republic (from 1940)
New Flag of Monaco Monaco
Flag of Andorra Andorra (from 1940)

confederate riots:

Bandera FE JONS Falange
Flag of UPA UPA
Flag of Russian Fascist Party All-Russian Fascist Party
Narodowe Odrodzenie Polski flag National Radical Camp
Drapeaux National Socialist Movement National Socialist Movement
VapsLogo Vaps Movement
Perkonkrusta karogs Pērkonkrusts
KKK-symbol Ku Klux Klan
Union Nacional Sinarquista-1- National Synarchist Union
Flag of Dayar Mongol Dayar Mongol
Flag of the Syrian Social Nationalist Party Syrian Social Nationalist Party
Villa Baviera
Flag of the People's Action Party of Vietnam People's Action Party of Vietnam
Flag of Sindhudesh Sindhudesh
Flag of the British Union of Fascists British Union of Fascists
Fine Gael historical flag Blueshirts
Nazi Canadian flag National Unity Party
OssewaBrandwagWapen Afrikaner Weerstandsbeweging
Afrikaner Weerstandsbeweging flag Ossewabrandwag
Partito Fascista Sammarinese Sammarinese Fascist Party
22px Kataeb Party
IrishRepublicanFlag IRA

Supported by:

Flag of the Vatican City Vatican City
Flag of Portugal Portugal
Flag of Spain (1785-1873 and 1875-1931) Spain (before 1931)

Flag of Liechtenstein Liechtenstein (before 1938)