March 9 - An Italian offensive is unsuccessful against the Greeks on the Albanian front.
March 12 - The war between the USSR and Finland ends. Karelia is part of the USSR.
March 13 - Finland signs a peace treaty with the USSR.
March 24 - elections of deputies to the Supreme Bodies of State Power of the Soviet Union and Soviet Ukraine in the Western Lands of Ukraine.
March 25 - Yugoslav Prince Paul signs an agreement on mutual assistance with Italy and Germany.
March 27 - Yugoslav Prince Pavel is overthrown by an anti-fascist military coup.
April 9 - Germany launches a military operation to occupy Denmark and Norway.
May 10 - Wehrmacht forces launch offensive on the Western Front against Belgium, the Netherlands and Luxembourg.
May 14 - Holland surrenders in World War II.
June 15 - August 6 - occupation of the Baltic States by the Red Army and their annexation by the USSR.
June 28 - July 3 - a military operation of the Red Army to forcibly transfer Romania to Bessarabia and Northern Bukovina to the USSR.
November 12 and 13 - State visit to Berlin by Vyacheslav Molotov, Chairman of the People's Commissar, People's Commissar for Foreign Affairs of the USSR, member of the Politburo of the Central Committee of the CPSU (B) for talks with the German leadership on foreign policy.
November 15 - German aircraft bomb the city of Coventry in the UK. The bombing lasted 10 hours and involved more than 500 aircraft.
See also Category: Born 1940
February 1 - Valery Pavlovich Antonovych, Ukrainian chemist-analyst, Doctor of Chemical Sciences (1986), Professor (1989).
February 19 - Niyazov Saparmurat Ataevich, President of Turkmenistan (1995–2006, † 2006).
February 19 - Smokey Robinson, American singer, songwriter.
February 23 - Peter Fonda, American film director, actor.
March 1 - Jozef Jozefowicz Sabo, Ukrainian football player, coach.
March 10 - Chuck Norris, American athlete, film actor.
March 12 - Grigory Izrailevich Gorin, Russian writer, playwright, screenwriter.
March 14 - Shovkun Viktor Yosypovych translator, writer, literary editor.
March 16 - Bernardo Bertolucci, Italian poet, playwright, film director.
April 13 - Vladimir Cosma, French composer.
April 16 �