1925 (MCMXXV) merupakan tahun biasa yang diawali hari Kamis dalam kalender Gregorian, tahun ke-1925 dalam sebutan Masehi (CE) dan Anno Domini (AD), tahun ke-925 pada Milenium ke-2, tahun ke-25 pada Abad ke-20, dan tahun ke- 6 pada dekade 1920-an. Denominasi 1925 untuk tahun ini telah digunakan sejak periode Abad Pertengahan awal, ketika Era kalender Anno Domini (Tahun Masehi) menjadi metode lazim di Eropa untuk penamaan tahun.

Peristiwa

• Keanggotaan di Volksraad ditetapkan 60:30; 60 orang Belanda, 25 Indonesia, dan 5 anggota lainnya keturunan Arab atau Tionghoa.
• 17 Juni - Perjanjian Anti-Penggunaan Senjata Kimia

Kelahiran

• 2 Januari - Patrice Lumumba, Perdana Menteri dan Menteri Pertahanan Republik Demokratik Kongo.
• 12 Januari - Pang Tjin Nio, seniman dan penyanyi lagu dalem Gambang Kromong klasik tiga zaman (w. 2014)
• 2 Februari - Pramoedya Ananta Toer.
• 14 Februari - Robert Wolter Monginsidi, Malalayang.
• 20 Mei - Ahmed Shawki Ibrahim, dokter dan presenter dari program Mesir, Presiden Akademi Riset Ilmiah dari Quran dan alhi Sunnah.
• 11 Juni - William Styron, Novelis dari Amerika Serikat.
• 19 Juni - D.I. Pandjaitan, Pahlawan Revolusi Indonesia (w. 1965).
• 20 Juni - Audie Murphy Angkatan Darat Amerika Serikat
• 10 Juli – Mahathir Mohamad, Perdana Menteri Malaysia
• 25 Juli – Sarwo Edhie Wibowo, mantan komandan RPKAD.
• 25 September - Hasan di Tiro, politisi Aceh, tokoh pendiri Gerakan Aceh Merdeka (w. 2010).
• 20 November - Bobby Kennedy Jaksa Agung
• 24 November - Yosaphat Sudarso, Salatiga.
• 30 November - Bill Gates Sr. (w. 2020)
• 25 Desember - H.Bokir, seniman lenong Betawi (w. 2002)

Kematian

January–February

• 4 Januari – Nellie Cashman, Irish-born prospector (b. 1845)
• 8 Januari – George Bellows, American artist (b. 1882)
• 14 Januari
  • Camille Decoppet, Swiss Federal Councilor (b. 1852)
  • Harry Furniss, English cartoonist, illustrator and pioneer animator (b. 1854)
• 26 Januari
  • Caspar F. Goodrich, American admiral (d. 1847)
  • Sir James Mackenzie, Scottish cardiologist (d. 1853)
• 31 Januari – George Washington Cable, American writer (b. 1844)
• 2 Februari – Jaap Eden, Dutch speed skater (b. 1873)
• 3 Februari – Oliver Heaviside, English mathematician (b. 1850)
• 4 Februari – Robert Koldewey, German architect and archaeologist (b. 1855)
• 10 Februari – Aristide Bruant, French singer and nightclub owner (b. 1851)
• 11 Februari – H.E. Beunke, Dutch writer (b. 1851)
• 18 Februari – James Lane Allen, American writer (b. 1849)
• 24 Februari – Hjalmar Branting, Prime Minister of Sweden, recipient of the Nobel Peace Prize (b. 1860)
• 25 Februari – Louis Feuillade, French silent film director (b. 1873)
• 28 Februari – Friedrich Ebert, President of Germany (Weimar Republic) (b. 1871)

March–April

• 2 Maret – Luigj Gurakuqi, Albanian freedom fighter (assassinated) (b. 1879)
• 4 Maret
  • Moritz Moszkowski, Polish composer (b. 1854)
  • James Ward, English philosopher and psychologist (b. 1843)
  • John Montgomery Ward, American baseball player (b. 1860)
• 5 Maret – Clement Ader, French Army Captain and Aviation pioneer (b. 1841)
• 7 Maret – Georgy Evgenyevich Lvov, Prime Minister of Russia (b. 1861)
• 10Maret – Myer Prinstein, American track athlete (b. 1878)
• 12 Maret
  • Gergely Luthár, Hungarian Slovene writer (b. 1841)
  • Sun Yat-sen, Chinese revolutionary (b. 1866)
• 14 Maret
  • Walter Camp, American football coach (b. 1859)
  • H. Rider Haggard, English novelist (b. 1856)
• 20 Maret – George Nathaniel Curzon, 1st Marquess Curzon of Kedleston, Viceroy of India (b. 1859)
• 28 Maret – Henry Rawlinson, 1st Baron Rawlinson, British general (b. 1864)
• 30 Maret – Rudolf Steiner, Austrian philosopher (b. 1861)
• 6 April – Alexandra Kitchin, British model for Lewis Carroll (b. 1864)
• 7 April – Tikhon of Moscow, Patriarch of the Russian Orthodox Church (b. 1865)
• 13 April – Elwood Haynes, American inventor (b. 1857)
• 14 April – John Singer Sargent, American artist (b. 1856)
• 15 April – Fritz Haarmann, German serial killer (executed) (b. 1879)
• 19 April – John Walter Smith, American politician (b. 1845)
• 22 April – André Caplet, French composer and conductor (b. 1878)

May–June

• 2 Mei
  • Johann Palisa, Austrian astronomer (b. 1848)
  • Antun Branko Simic, Croatian poet (b. 1898)
• 7 Mei
  • William Hesketh Lever, English industrialist, Philanthropist and politician (b. 1851)
  • Doveton Sturdee, British admiral (b. 1859)
• 10 Mei – William Massey, Prime Minister of New Zealand (b.1856)
• 12 Mei
  • Amy Lowell, American poet (b. 1874)
  • Charles Mangin, French general (b. 1866)
• 14 Mei – H. Rider Haggard, English writer (b. 1856)
• 20 Mei
  • Elias M. Ammons, Governor of Colorado (b. 1860)
  • Joseph Howard, 1st Prime Minister of Malta (b. 1862)
• 21 Mei – Hidesaburō Ueno, Japanese agricultural scientist and guardian of Hachikō (b. 1871)
• 22 Mei – John French, 1st Earl of Ypres, British World War I field marshal (b. 1852)
• 31 Mei – John Palm, Curaçao born composer (b. 1885)
• 1 Juni
  • Lucien Guitry, French actor (b. 1860)
  • Thomas R. Marshall, Vice President of the United States (b. 1854)
• 2 Juni – James Ellsworth, American mine owner and banker (b. 1849)
• 16 Juni – Emmett Hardy, American jazz cornetist (b. 1903)
• 17 Juni – Adolf Pilar von Pilchau, Baltic German politician, regent of the United Baltic Duchy and baron (b. 1851)
• 18 Juni – Robert M. La Follette, Sr., American politician (b. 1855)
• 22 Juni – Felix Klein, German mathematician (b. 1849)
• 29 Juni – Christian Michelsen, Prime Minister of Norway (b. 1857)

July–August

• 1 Juli – Erik Satie, French composer (b. 1866)
• 7 Juli – Clarence Hudson White American photographer (b. 1871)
• 14 Juli – Pancho Villa, Filipino world boxing champion (b. 1901)
• 17 Juli – Lovis Corinth, German painter (b. 1858)
• 26 Juli
  • Antonio Ascari, Italian race car driver (b. 1888)
  • William Jennings Bryan, American lawyer and politician (b. 1860) (diabetes and fatigue)
  • Gottlob Frege, German mathematician and philosopher (b. 1848)
• 15 Agustus – Konrad Mägi, Estonian landscape painter (b. 1878)
• 17 Agustus – Ioan Slavici, Romanian writer (b. 1848)
• 25 Agustus – Franz Graf Conrad von Hötzendorf, Austrian field marshal (b. 1852)

September–October

• 7 September – René Viviani, Prime Minister of France (b. 1863)
• 16 September – Alexander Alexandrovich Friedman, Russian mathematician (b. 1888)
• 17 September – Carl Eytel, German-American artist working in Palm Springs, California (b. 1862)
• 29 September – Léon Bourgeois, French statesman, recipient of the Nobel Peace Prize (b. 1851)
• 7 Oktober – Christy Mathewson, American baseball player (b. 1880)
• 31 Oktober
  • Mikhail Frunze, Russian Bolshevik leader (b. 1885)
  • Max Linder, French silent film actor (b. 1883) (suicide)

November–December

• 1 November – Lester Cuneo, American actor (b. 1888)
• 3 November – Lucile McVey, American actress, part of comedy team with her late husband Sidney Drew (b. 1890)
• 6 November – Khai Dinh, Emperor of Vietnam (b. 1885)
• 20 November – Alexandra of Denmark, queen of Edward VII of the United Kingdom (b. 1844)
• 25 November – King Vajiravudh of Siam (b. 1880)
• 5 Desember – Wladyslaw Reymont, Polish writer, Nobel Prize laureate (b. 1867)
• 8 Desember – Marguerite Marsh, American actress (b. 1888)
• 9 Desember – Pablo Iglesias, co-founder of the Spanish Socialist Workers Party (b. 1850)
• 15 Desember – Battling Siki, Senegalese boxer (b. 1897)
• 19 Desember – Jose Ignacio Quinton, Puerto Rican composer and pianist (b. 1881)
• 21 Desember
  • Lottie Lyell, Australian female pioneer film director and producer (b. 1890)
  • Jules Méline, Prime Minister of France (b. 1838)
• 22 Desember
  • Alice Heine, American wife of Albert I of Monaco (b. 1858)
  • Mary Thurman, American actress (b. 1895)
• 25 Desember – Karl Abraham, German psychoanalyst (b. 1877)
• 28 Desember
  • Raymond P. Rodgers, American admiral (b. 1849)
  • Sergei Aleksandrovich Yesenin, Russian lyrical poet (b. 1895)
• 29 Desember – Félix Vallotton, Swiss painter (b. 1865)
• 31 Desember – J. Gordon Edwards, Canadian film director (b. 1867)

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