Which countries didn't participate in WW2?

Sweden, Finland, Switzerland, Portugal, Spain, Turkey, Ireland in Europe.

All the countries in South America and Africa. Although north African countries like Morocco were battlegrounds. Middle Eastern countries like Iran, Syria, Lebanon, Saudi Arabia and other countries on Arabian peninsula, Iraq, etc.

All of South and Central America; Sweden, Switzerland and Spain in Europe; many Asian nations and probably a few Pacific island nations that were not invaded by the Japanese.

there were 6 major European powers that sat out WWII while 13 others were overrun and occupied. Switzerland, Sweden, Ireland, Spain and Portugal and Turkey were so called neutrals during the war. For an interesting look into these please check out this article: http://www.thehistorynet.com/wwii/letter...

Axis powers: Germany, Japan, Italy, Finland, Hungary, Romania, Bulgaria, Croatia, Slovakia Allied ability: u . s ., uk, Soviet Union, Australia, France, Canada, China, Poland, Greece, Netherlands, Czechoslovakia, Belgium, Luxembourg, Norway, Yugoslavia impartial powers: Argentina, eire, Portugal, Spain, Sweden, Switzerland, Turkey, and Vatican city Now some would say that 51 international places faught for the allies. when you consider that 51 international places were structure contributors of the UN, and with the intention to finish that they had to of faught hostile to a minimum of one axis ability.

sweden, portugal, Spain (they supported hitler but never officially), Most of Latin America did not declare war on Germany, Ireland, switzerland

Finland definitely did participate in WWII...they were the first country attacked by the Soviet Union after they (the Soviets) signed their "non-aggression pact" with the Nazis...BTW the Finns kicked their asses....D

Ireland remained neutral, sort of. Antarctica stayed out of the war, but then noone was really worried about the penguins.

There must have been others.