1925 was a free year.
January 3 - Benito Mussolini announces he is taking over dictatorial powers over Italy.
February 8 - Elections for MPs of the Kingdom of Serbs, Croats and Slovenes.
April 15 - May 29 - Chess tournament in Baden-Baden. Alexander Alekhine won.
June 17 - The Geneva Protocol is signed, banning the use of war poisons in war.
July 18 - Adolf Hitler, the future Nazi leader of Germany, publishes the first volume of his personal manifesto, Mein Kampf.
July 21 - At the Scopes trial, high school biology teacher John T. Scoops was convicted of teaching evolution and fined $ 100.
October 2 - John Logie Byrd transmits the first television picture with shades in the laboratory.
5—16. October - Locarno Agreements
October 31 - Reza Shah Pahlavi ascends the Iranian throne and establishes the Pahlavi dynasty.
January 9 - Lee van Cliff, American actor (prem. 1989)
January 13 - Gwen Verdon, American actress, singer and dancer (prem. 2000)
January 26 - Joan Leslie, American actress (prem. 2015)
February 8 - Jack Lemon, American actor (prem. 2001)
February 11 - Kim Stanley, American actress (prem. 2001)
February 17 - Hal Holbrooke, American actor, director and screenwriter (prem. 2021)
February 20 - Robert Altman, American director, screenwriter and producer (prem. 2006)
February 21 - Sam Pekinpo, American director and screenwriter (prem. 1984)
March 12 - Luizon Bobe, French cyclist (prem. 1983)
March 21 - Peter Brook, English director
March 21 - Hugo Koblet, Swiss cyclist (prem. 1964)
April 14 - Rod Steiger, American actor (prem. 2002)
May 3 - Olivera Markovic, Serbian actress (prem. 2011)
May 11 - Max Morlock, German footballer (prem. 1994)
May 16 - Nilton Santos, Brazilian footballer (prem. 2013)
May 25 - Gene Crane, American actress (prem. 2003)
June 3 - Tony Curtis, American actor (prem. 2010)
June 21 - Maureen Stapleton, American actress (prem. 2006)
June 26 - Wolfgang Unziker, German chess player (prem. 2006)
July 2 - Patrice Lumumba, Congolese politician, First Prime Minister of the DRC and leader of the Congolese National Movement (1961)