April 18 is the 108th day of the year (109th in leap years) in the Gregorian calendar. There are 257 days remaining until the end of the year.
- 1902 – Quetzaltenango, Guatemala is destroyed by an earthquake.
- 1906 – 1906 San Francisco earthquake: San Francisco, California is largely destroyed by a major earthquake, and subsequent fires. Estimates suggest that 3,000 people have died, some of them after Mayor Eugene Schmitz orders a shoot-to-kill policy against looters. Operatic tenor Enrico Caruso, who was in the city at the time, fled, never to return.
- 1909 - Joan of Arc is beatified in Rome.
- 1912 - Cunard liner RMS Carpathia brings 705 survivors from the RMS Titanic sinking to New York City.
- 1915 - French pilot Roland Garros is shot down and glides to a landing on the German side of the lines during World War I.
- 1923 – The Yankee Stadium opens in New York City.
- 1924 - Simon & Schuster publishes the first crossword puzzle book.
- 1930 - BBC Radio announces that there is no news for that day.
- 1941 - Vichy France announces its withdrawal from the League of Nations.
- 1942 – Pierre Laval becomes Prime Minister of Vichy France.
- 1945 – World War II: 1,000 bombers attack the island of Heligoland in the North Sea.
- 1946 – The International Court of Justice meets for the first time in The Hague.
- 1954 – Gamal Abdel Nasser takes power in Egypt.
- 1955 – World-famous physicist Albert Einstein dies aged 76.
- 1955 - Representatives of 29 nations meet in Bandung, Indonesia, for the first Asian-African Conference.
- 1958 - A US Federal Court rules that controversial poet Ezra Pound can be released from an insane asylum.
- 1974 - Prime Minister of Pakistan Zulfiqar Ali Bhutto opens Lahore's Dry Port.
- 1980 – The Republic of Zimbabwe becomes independent from the UK, with Canaan Banana as its first President. Robert Mugabe becomes Prime Minister, assuming the presidency in 1987.
- 1981 – The longest-ever game of professional baseball begins in Pawtucket, Rhode Island.
- 1983 – The US Embassy in Beirut, Lebanon, is hit by a suicide bomber, killing 63 people.
- 1988 - The United States launches Operation Praying Mantis against Iranian forces in the Iran-Iraq War.
- 1992 – General Abdul Rashid Dostum revolts against President Mohammed Najibullah in Afghanistan.
- 1996 – At least 106 civilians in Lebanon are killed when Israeli Defense Forces shell a UN compound in Qana.
- 1996 - Islamic fundamentalists carry out a terror attack on a hotel in Cairo, killing 18 Greek tourists, who they mistook for Israelis.
- 359 - Gratian, Roman Emperor (d. 383)
- 1115 - Gertrud of Süpplingenburg, Saxon noblewoman (d. 1143)
- 1480 – Lucrezia Borgia, Florentine ruler (d. 1519)
- 1580 - Thomas Middleton, English dramatist (d. 1621)
- 1590 – Ahmed I, Ottoman Sultan (d. 1617)
- 1605 – Giacomo Carissimi, Italian composer (d. 1674)
- 1647 - Elias Brenner, Finnish-Swedish artist (d. 1717)
- 1772 - David Ricardo, English political economist (d. 1823)
- 1782 - Georg August Goldfuss, German palaeontologist and zoologist (d. 1848)
- 1797 - Adolphe Thiers, 2nd President of France (d. 1877)
- 1813 - James McCune Smith, American physician and writer (d. 1865)
- 1819 – Carlos Cespedes, Cuban revolutionary (d. 1874)
- 1838 - Paul Emile Lecoq de Boisbaudran, French chemist (d. 1912)
- 1857 – Clarence Darrow, American lawyer (d. 1938)
- 1857 - Alexander Shirvanzade, Armenian playwright and novelist (d. 1935)
- 1858 – Dhondo Keshav Karve, Indian social reformer (d. 1962)
- 1858 – Alexander Shirvanzade, Armenian playwright and novelist (d. 1935)
- 1863 – Leopold Graf Berchtold, Austrian-Hungarian foreign minister (d. 1942)
- 1863 - Linton Hope, English architect and sailor (d. 1920)
- 1864 – Richard Harding Davis, American writer (d. 1916)
- 1874 – Oskar Ernst Bernhardt, German writer (d. 1941)
- 1877 - Vicente Sotto, Filipino patriot and writer (d. 1950)
- 1879 - Korneli Kekelidze, Georgian philologist (d. 1962)
- 1880 - Sam Crawford, American baseball player, coach and umpire (d. 1968)
- 1882 - Leopold Stokowski, Polish conductor (d. 1977)
- 1882 – Isaac Babalola Akinyele, Nigerian ruler and writer (d. 1964)
- 1884 - Jaan Anvelt, Estonian Communist revolutionary and writer (d. 1937)
- 1889 - Jessie Street, American activist (d. 1970)
- 1890 - Grand Duchess Maria Pavlovna of Russia, Russian royal (d. 1958)
- 1893 - Violette Morris, French shot putter and discus thrower (d. 1944)
- 1896 - Ha Hye-sok, Korean poet, feminist, writer, painter, educator and journalist (d. 1948)
- 1897 – Ardito Desio, Italian topographer (d. 2001)
- 1897 - Per-Erik Hedlund, Swedish cross-country skier (d. 1975)
- 1901 – Al Lewis, American lyricist (d. 1967)
- 1901 – Elene Akhvlediani, Georgian artist (d. 1975)
- 1902 – Giuseppe Pella, Prime Minister of Italy (d. 1981)
- 1905 – George H. Hitchings, American scientist (d. 1998)
- 1907 – Miklos Rozsa, Hungarian composer (d. 1995)
- 1911 – Maurice Goldhaber, Austrian-American physicist (d. 2011)
- 1914 - Claire Martin, Canadian writer (d. 2014)
- 1917 – Frederika of Hanover, Queen Consort of Greece (d. 1981)
- 1918 – Gabriel Axel, Danish movie director, screenwriter and actor (d. 2014)
- 1918 - Harry Firth, Australian racing driver (d. 2014)
- 1918 - Shinobu Hashimoto, Japanese screenwriter (d. 2018)
- 1918 - André Bazin, French critic and theorist (d. 1958)
- 1919 - Vondell Darr, American actress (d. 2012)
- 1921 - Jean Richard, French actor (d. 2001)
- 1922 - Barbara Hale, American actress (d. 2017)
- 1924 - Clarence Gatemouth Brown, American blues guitarist (d. 2005)
- 1924 - Roy Mason, British politician (d. 2015)
- 1925 - Bob Hastings, American actor (d. 2014)
- 1926 - Harry Volkman, American meteorologist (d. 2015)
- 1927 – Tadeusz Mazowiecki, Polish writer, journalist and politician (d. 2013)
- 1927 - Charles Pasqua, French politician (d. 2015)
- 1927 – Samuel P. Huntington, American political scientist (d. 2008)
- 1928 - Otto Piene, German artist (d. 2014)
- 1928 - Karl Josef Becker, German theologian and cardinal (d. 2015)
- 1929 - Mario Francesco Pompedda, Italian cardinal (d. 2006)
- 1930 - Jean Guillou, French composer and organist
- 1931 - Klas Lestander, Swedish biathlete
- 1933 - Enrico Crispolti, Italian art critic, curator and art historian (d. 2018)
- 1934 – James Drury, American actor
- 1934 - Pedro Tenorio, Governor of the Northern Marianas (d. 2018)
- 1936 - Tarcisio Gitti, Italian politician (d. 2018)
- 1937 – Jan Kaplicky, Czech-British architect (d. 2009)
- 1937 - Teddy Taylor, British politician (d. 2017)
- 1940 – Joseph L. Goldstein, American scientist
- 1940 – Mike Vickers, British musician and composer
- 1940 - Ira von Fürstenberg, Italian socialite, actress and jewellery designer
- 1941 – Michael D. Higgins, 9th President of Ireland
- 1942 – Jochen Rindt, Austrian racecar driver (d. 1970)
- 1943 - Zeki Alasya, Turkish actor and director (d. 2015)
- 1944 - Albin Planinc, Yugoslavian chess player (d. 2008)
- 1944 – Robert Hanssen, American double agent
- 1944 - Frances D'Souza, Baroness D'Souza, English academic and politician
- 1945 – Margaret Hassan, Irish aid worker (d. 2004)
- 1946 - Hayley Mills, British actress
- 1946 - Irene Fernandez, Malaysian activist (d. 2014)
- 1946 - Janet Kagan, American writer (d. 2008)
- 1947 – Jerzy Stuhr, Polish actor and director
- 1947 – Moses Blah, Liberian politician (d. 2013)
- 1947 – Cindy Pickett, American actress
- 1947 – James Woods, American actor
- 1947 - Herbert Mullin, American serial killer
- 1950 - Kenny Ortega, American director, producer and choreographer
- 1953 - Rick Moranis, Canadian-American actor, singer and screenwriter
- 1956 – Eric Roberts, American actor
- 1956 - Melody Thomas Scott, American actress
- 1956 - Roberto Calderoli, Italian politician
- 1958 - Malcolm Marshall, Barbadian cricketer
- 1959 - Frank Mulholland, Scottish lawyer
- 1960 - Neo Rauch, German artist
- 1960 - J. Christopher Stevens, American diplomat (d. 2012)
- 1961 - Jane Leeves, British actress
- 1961 – Steve Lombardi, American professional wrestler
- 1963 – Eric McCormack, Canadian actor
- 1963 – Conan O'Brien, American comedian
- 1963 - Universo 2000, Mexican professional wrestler (d. 2018)
- 1964 – Niall Ferguson, British historian
- 1964 - Rithy Panh, Cambodian documentary moviemaker
- 1966 - Valeri Kamensky, Russian ice hockey player
- 1966 - Trine Hattestad, Norwegian javelin thrower
- 1966 - Camille Coduri, English actress
- 1967 – Maria Bello, American actress
- 1968 – David Hewlett, English-Canadian actor
- 1969 - Princess Sayako of Japan
- 1970 - Esther Schweins, German actress
- 1970 – Saad Hariri, Lebanese Prime Minister
- 1971 – Samantha Cameron, wife of David Cameron
- 1971 – David Tennant, Scottish actor
- 1971 – Oleg Petrov, Russian ice hockey player
- 1972 - Rosa Clemente, American journalist and activist
- 1972 - Eli Roth, American director
- 1972 - Lars Christiansen, Danish handball player
- 1973 – Haile Gebrselassie, Ethiopian runner
- 1973 - Arnaud Beltrame, French gendarme (d. 2018)
- 1974 - Mark Tremonti, American musician
- 1974 - Edgar Wright, English director and writer
- 1976 – Melissa Joan Hart, American actress
- 1976 – Rodrigo de la Serna, Argentine actor
- 1976 – Sean Maguire, English actor
- 1977 – Hassan El Fakri, Norwegian footballer
- 1977 – Jonathan Rowson, Scottish chess player
- 1979 – Matthew Upson, English footballer
- 1979 – Kourtney Kardashian, American reality TV personality
- 1979 – Anthony Davidson, British racing driver
- 1980 – Rabiu Afolabi, Nigerian footballer
- 1980 – Carolina Crescentini, Italian actress
- 1980 – Robyn Regehr, Canadian ice hockey player
- 1981 – Milan Jovanovic, Serbian footballer
- 1982 – Simone Farina, Italian footballer
- 1983 – Miguel Cabrera, Venezuelan baseball player
- 1983 – Hernán Rengifo, Peruvian footballer
- 1984 – America Ferrera, American actress
- 1985 – Lukasz Fabianski, Polish footballer
- 1985 – Rachel Smith, American model
- 1986 – Maurice Edu, American soccer player
- 1986 – Mateusz Rutkowski, Polish ski jupmer
- 1987 – Danny Guthrie, English footballer
- 1987 – Rosie Huntington-Whiteley, British model and actress
- 1987 – Samantha Jade, Australian singer-songwriter
- 1987 – Cara Maria Wayans, American actress
- 1988 – Anagabriela Espinoza, Mexican model
- 1989 – Hannah Wang, Australian actress
- 1989 – Jessica, Korean-American actress, model and singer (Girls' Generation)
- 1990 – Wojciech Szczesny, Polish footballer
- 1990 – Britt Robertson, American actress
- 1992 – Chloe Bennet, American actress and singer
- 1993 – Nathan Sykes, British singer (The Wanted)
- 1995 – Divock Origi, Belgian footballer
- 1996 – Ski Mask the Slump God, American rapper and songwriter
- 2007 – Hayah bint Hamzah, Princess of Jordan
- 1143 - Gertrud of Süpplingenburg, Saxon noblewoman (b. 1115)
- 1161 – Theobald of Bec, Archbishop of Canterbury
- 1556 – Luigi Alamanni, Italian poet (b. 1495)
- 1567 – Wilhelm von Grumbach, German adventurer (b. 1503)
- 1674 – John Graunt, English statistician (b. 1620)
- 1794 – Charles Pratt, 1st Earl Camden, Lord Chancellor of Great Britain (b. 1714)
- 1796 - Johan Wilcke, Swedish physicist (b. 1732)
- 1802 – Erasmus Darwin, English physician and botanist (b. 1731)
- 1832 - Jeanne-Elisabeth Chaudet, French painter (b. 1761)
- 1859 - Tatya Tope, Indian general (b. 1814)
- 1864 - Juris Alunans, Latvian philologist (b. 1832)
- 1873 – Justus von Liebig, German scientist (b. 1803)
- 1898 – Gustave Moreau, French painter (b. 1826)
- 1905 - Juan Valera, Spanish writer, diplomat and politician (b. 1824)
- 1906 - Luis Martín, Spanish Superior-General of the Society of Jesus (b. 1846)
- 1936 - Ottorino Respighi, Italian composer (b. 1879)
- 1941 - Alexandros Koryzis, Prime minister of Greece (b. 1885)
- 1942 – Gertrude Vanderbilt Whitney, American sculptor and art collector (b. 1875)
- 1943 – Isoroku Yamamoto, Japanese admiral (b. 1884)
- 1945 – John Ambrose Fleming, English physicist and engineer (b. 1849)
- 1945 – Ernie Pyle, American journalist (b. 1900)
- 1945 – William, Prince of Albania (b. 1876)
- 1947 – Jozef Tiso, Slovakian politician (b. 1887)
- 1949 – Ulrich Salchow, Swedish figure skater (b. 1877)
- 1951 – Antonio Oscar Carmona, Portuguese politician (b. 1869)
- 1955 – Albert Einstein, German physicist and Nobel laureate (b. 1879)
- 1957 - Ben W. Hooper, 33rd Governor of Tennessee (b. 1870)
- 1958 – Maurice Gamelin, French general (b. 1872)
- 1964 - Ben Hecht, American director, producer and screenwriter (b. 1894)
- 1965 - Guillermo Gonzalez Camarena, Mexican inventor and engineer (b. 1917)
- 1974 – Marcel Pagnol, French writer and movie maker (b. 1895)
- 1976 - Mahmoud Younis, Egyptian engineer (b. 1911)
- 1988 - Pierre Desproges, French journalist, comedian and actor (b. 1939)
- 1991 - Gabriel Celaya, Spanish poet (b. 1911)
- 1992 - Frankie Howerd, English comedian and actor (b. 1917)
- 1993 - Masahiko Kimura, Japanese judoka (b. 1917)
- 1995 – Arturo Frondizi, President of Argentina (b. 1908)
- 1996 - Piet Hein, Danish scientist, mathematician and inventor (b. 1905)
- 1998 - Terry Sanford, 65th Governor of North Carolina (b. 1917)
- 2002 – Thor Heyerdahl, Norwegian explorer, ethnographer, zoologist and writer (b. 1914)
- 2004 – Kamisese Mara, first Prime Minister of Fiji (b. 1920)
- 2007 – Iccho Itoh, Japanese politician, Mayor of Nagasaki (b. 1945)
- 2008 - Germaine Tillion, French anthropologist (b. 1907)
- 2011 – Pietro Ferrero Jr., Italian businessman (b. 1963)
- 2011 – William Donald Schaefer, American politician (b. 1921)
- 2012 – Dick Clark, American radio and television host, and producer (b. 1929)
- 2013 - Storm Thorgerson, British graphic designer (b. 1944)
- 2014 - Dylan Tombides, Australian footballer (b. 1994)
- 2014 - Brian Priestman, British maestro and conductor (b. 1927)
- 2014 - Derek Cooper, British broadcaster and food naturalist (b. 1925)
- 2014 - Andrew Sessler, American physicist (b. 1928)
- 2015 - Mario Pirani, Italian journalist (b. 1925)
- 2015 - Erwin Waldner, German footballer (b. 1933)
- 2016 - Yuri Bychkov, Russian art historian (b. 1931)
- 2016 - Cox Habbema, Dutch actress (b. 1944)
- 2016 - Eva Henning, Swedish actress (b. 1920)
- 2016 - Sir John Leslie, 4th Baronet, Irish aristocrat and media personality (b. 1916)
- 2016 - Johan van Minnen, Dutch journalist and politician (b. 1932)
- 2017 - Yvonne Monlaur, French actress (b. 1939)
- 2017 - Jaak Panksepp, Estonian-American neuroscientist (b. 1943)
- 2018 - Luisa Pastor Lillo, Spanish politician (b. 1948)
- 2018 - Bruno Sammartino, Italian-American professional wrestler (b. 1935)
- 2018 - Henk Schouten, Dutch footballer (b. 1932)
- 2018 - Jeanne Wilson, American swimmer (b. 1926)
- 2018 - Dale Winton, English television presenter (b. 1955)
- 2019 - Jameel Jalibi, Pakistani linguist, writer and academic (b. 1929)
- 2019 - Con de Lange, South African-Scottish cricketer (b. 1981)
- 2019 - Lyra McKee, Northern Irish journalist (b. 1990)
- 2019 - Lorraine Warren, American paranormal investigator (b. 1927)