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1955 (MCMLV) was a common year starting on Saturday (dominical letter B) of the Gregorian calendar, the 1955th year of the Common Era (CE) and Anno Domini (AD) designations, the 955th year of the 2nd millennium, the 55th year of the 20th century, and the 6th year of the 1950s decade.
- March – A young Jim Henson builds the first version of Kermit the Frog.
- March 2
- Claudette Colvin (a fifteen-year-old African-American girl) refuses to give up her seat on a bus in Montgomery, Alabama, to a white woman after the driver demands it. She is carried off the bus backwards while being kicked and handcuffed and harassed on the way to the police station.
- Serious floods in Australia.
- March 5
- WBBJ-TV signs on the air in the Jackson, Tennessee, with WDXI as its initial call-letters, to expanded American commercial television in mostly-rural areas.
- Elvis Presley makes his television debut on "Louisiana Hayride" carried by KSLA-TV Shreveport (although audio recordings exists, there is no known video footage of this appearance).
- March 7 – The Broadway musical version of Peter Pan, which had opened in 1954 starring Mary Martin, is presented on television for the first time by NBC-TV with its original cast, as an installment of Producers' Showcase. It is also the first time that a stage musical is presented in its entirety on TV almost exactly as it was performed on stage. This program gains the largest viewership of a TV special up to this time, and it becomes one of the first great TV family musical classics.
- March 17 – Richard Riot in Montreal: 6,000 people protest the suspension of French Canadian ice hockey star Maurice Richard of the Montreal Canadiens by the National Hockey League following a violent incident during a match.
- March 19 – KXTV signs on the air in Sacramento, California.
- March 20 – The movie adaptation of Evan Hunter's novel Blackboard Jungle premieres in the United States, featuring the famous single "Rock Around the Clock" by Bill Haley & His Comets. Teenagers jump from their seats to dance to the song.
- May 1 – Warsaw Treaty on Friendship, Cooperation and Mutual Assistance signed (Warsaw Treaty Organization) (effective June 6).
- May 5 – West Germany becomes a sovereign country recognized by important Western foreign countries, such as France, the United Kingdom, Canada, and the United States.
- May 6 – WEU charter effective.
- May 9 – West Germany joins the North Atlantic Treaty Organization (NATO).
- May 11 – Japanese National Railways' ferry Shiun Maru sinks after collision with sister ship Uko Maru in thick fog off Takamatsu, Shikoku, in the Seto Inland Sea of Japan; 166 passengers (many children) and two crew are killed. This event is influential in plans to construct the Akashi Kaikyō Bridge (built 1986-98).
- May 12– New York's Third Avenue Elevated runs its last train between Chathem Square in Manhattan and East 149th Street in the Bronx, thus ending elevated train service in Manhattan.
- May 14 – Eight Communist Bloc countries, including the Soviet Union, sign a mutual defence treaty in Warsaw, Poland, that is called the Warsaw Pact. It will be dissolved in 1991.
- May 15 – Austrian State Treaty, which restores Austria's national sovereignty, is concluded between the four occupying powers following World War II (the United Kingdom, the United States, the Soviet Union, and France) and Austria, setting it up as a neutral country.
- May 25 – Joe Brown and George Band are the first to attain the summit of Kangchenjunga in the Himalayas, as part of a British team led by Charles Evans.
- July 7 – The New Zealand Special Air Service is formed.
- July 13 – Ruth Ellis is hanged for murder in London, becoming the last woman ever to be executed in the United Kingdom.
- July 17 – The American Broadcasting Company broadcasts a sneak preview of Disneyland in Anaheim, California.
- July 18
- Disneyland opens to the public in Anaheim, California.
- The first nuclear-generated electrical power is sold commercially, partially powering the town of Arco, Idaho.
- The Illinois Governor, William Stratton, signs the "Loyalty Oath Act", passed by the State Legislature, which mandates all public employees take a loyalty oath to Illinois and the United States, or lose their jobs.
- The first Geneva Summit meeting between the United States, the Soviet Union, the United Kingdom, and France begins. It ends on July 23.
- July 27 – El Al Flight 402 from Vienna, Austria to Tel Aviv via Istanbul is shot down over Bulgaria. All 58 passengers and crewmen aboard the Lockheed Constellation airplane are killed.
- July 28 – The first Interlingua Congress in Tours, France, leading to foundation of the Union Mundial pro Interlingua.
- October 2 – Alfred Hitchcock Presents debuts on the CBS TV network in the United States.
- October 3 – The Mickey Mouse Club debuts on the ABC-TV network in the United States.
- October 4 – The Reverend Sun Myung Moon is released from prison in Seoul, South Korea.
- October 5 – Disneyland Hotel opens to the public in Anaheim, California.
- October 11 – 70-mm film for projection is introduced with the theatrical release of Rodgers and Hammerstein's musical film, Oklahoma!.
- October 14 – Organization of Central American States secretariat inaugurated.
- October 20 – Disc jockey Bill Randle of WERE (Cleveland) is the key presenter of a concert at Brooklyn High School (Ohio), featuring Pat Boone and Bill Haley & His Comets and opening with Elvis Presley, Elvis's first filmed performance, for a documentary on Randle titled The Pied Piper of Cleveland.
- October 26
- October 27 – Film Rebel Without a Cause, starring James Dean, is released in the United States.
- October 29 – Soviet battleship Novorossiysk explodes at moorings in Sevastopol Bay, killing 608, the Soviet Union's worst naval disaster.
- December 4 – The International Federation of Blood Donor Organizations was founded in Luxembourg.
- December 5
- December 9 – Adnan Menderes of DP forms the new government of Turkey (22nd government)
- December 14
- The Tappan Zee Bridge over the Hudson River in New York State opens to traffic.
- Albania, Austria, Bulgaria, Cambodia, Finland, Hungary, Ireland, Italy, Jordan, Laos, Libya, Nepal, Portugal, Romania, Spain, and Sri Lanka join the United Nations simultaneously, after several years of moratorium on admitting new members that began during the Korean War.
- December 20 – Cardiff is declared by the British Government as the capital of Wales.
- December 22 – American cytogeneticist Joe Hin Tjio discovers the correct number of human chromosomes, forty-six.
- December 31 – General Motors becomes the first American corporation to make a profit of over one billion dollars in one year.
- World population: 2,755,823,000
- Africa: 246,746,000
- Asia: 1,541,947,000
- Europe: 575,184,000
- South America: 190,797,000
- North America: 186,884,000
- Oceania: 14,265,000
- January 1
- January 2 – Vivien Savage, French singer
- January 5 – Mamata Banerjee, Indian politician, Chief Minister of West Bengal
- January 6 – Rowan Atkinson, English comedian and actor
- January 9 – J. K. Simmons, American actor
- January 10 – Michael Schenker, German guitarist (Scorpions, UFO, Michael Schenker Group)
- January 13
- January 15
- January 17
- January 18 – Kevin Costner, American actor, producer and director
- January 19 – Sir Simon Rattle, English orchestral conductor
- January 20
- January 21 – Jeff Koons, American artist
- January 22 – Keiko Takahashi, Japanese actress
- January 25 – Petra Gerster, German television presenter and newscaster
- January 26
- January 27
- January 28
- January 29
- February 1 – Hans Werner Olm, German television and film comedian
- February 2 – Leszek Engelking, Polish poet, writer and translator
- February 3 – Kirsty Wark, Scottish television presenter
- February 6 – Michael Pollan, American journalist
- February 6 – Irinej Dobrijević, American-born Serbian Bishop of Australia and New Zealand
- February 7 – Miguel Ferrer, American actor
- February 8
- February 9
- February 10
- February 12 – Ai Satō, Japanese voice actress
- February 13 – Akiko Yano, Japanese singer-songwriter
- February 15
- February 17 – Mo Yan, Chinese writer
- February 19 – Jeff Daniels, American actor
- February 21 – Kelsey Grammer, American actor and comedian
- February 23
- February 24
- March 1 – Sir Timothy Laurence, English admiral and second husband of Anne, Princess Royal
- March 2
- March 3 – Kent Derricott, Canadian TV personality in Japan
- March 4 – Dominique Pinon, French actor
- March 5
- March 6 – Alberta Watson, Canadian actress (d. 2015)
- March 7 – Tommy Kramer, American football player
- March 8 – Don Ashby, Canadian ice hockey player (d. 1981)
- March 9
- March 10 – Yousra, Egyptian actress and singer
- March 11 – Nina Hagen, German pop singer
- March 13
- March 15
- March 16
- March 17 – Gary Sinise, American actor, producer and director
- March 18
- March 19
- March 20 – Mariya Takeuchi, Japanese singer-songwriter
- March 21 – Philippe Troussier, French football coach
- March 22
- March 23 – Moses Malone, American basketball player (d. 2015)
- March 24 – Kim Johnston Ulrich, American actress
- March 26 – Danny Arndt, Canadian ice hockey player
- March 27 – Mariano Rajoy, Prime Minister of Spain
- March 28
- March 29
- March 31 – Angus Young, Scottish-born Australian rock guitarist
- April 3
- April 5
- April 6 – Michael Rooker, American actor
- April 7
- April 8
- April 9 – Kate Heyhoe, American food writer
- April 11 – Kevin Brady, American politician
- April 13
- April 15 – Dodi Fayed, Egyptian businessman (d. 1997)
- April 16
- April 17 – Rob Bolland, Dutch musician, songwriter and music producer (Bolland & Bolland)
- April 18 – Bobby Castillo, American baseball player
- April 21
- April 23
- April 24 – John de Mol, Dutch media tycoon
- April 25
- April 26 – Chen Daoming, Chinese actor
- April 27 – Eric Schmidt, American software engineer and businessman, former CEO of Google (2001-2011)
- April 28 – Eddie Jobson, English musician
- April 29
- April 30 – Zlatko Topčić, Bosnian writer and screenwriter
- June 1 – Chiyonofuji Mitsugu, Japanese sumo wrestler (58th Yokozuna grand champion)
- June 2 – Dana Carvey, American actor and comedian
- June 5 – Fernando Borrego Linares, Cuban singer and songwriter (aka Polo Montañez)
- June 6
- June 7 – Tim Richmond, American race car driver (d. 1989)
- June 8
- June 10
- June 11 – Yuriy Sedykh, Ukrainian hammer thrower
- June 14
- Kim Lankford, American actress, businesswoman and horse wrangler
- Paul O'Grady (also known as "Lily Savage"), English talk show host and comedian
- June 15 – Polly Draper, American actress, screenwriter, playwright, producer and director
- June 16 – Laurie Metcalf, American actress
- June 18 – Sandy Allen, American, world's tallest woman (d. 2008)
- June 20 – Tor Nørretranders, Danish author
- June 21
- June 22 – Glenn Danzig, American rock singer (The Misfits, Samhain, Danzig)
- June 23 – Alan J. Gow, Australian-born British motorsport executive
- June 24 – Gurumayi Chidvilasananda, Indian head of Siddha Yoga
- June 26 – Yoko Gushiken, Japanese boxer
- June 27
- August 2 – Caleb Carr, American writer
- August 3 – Roger Gifford, Lord Mayor of London 2013
- August 4
- August 6
- August 7
- August 8 – Diddú (Sigrún Hjálmtýsdóttir), Icelandic soprano and songwriter
- August 9 – Doug Williams, American football quarterback
- August 10 – Mel Tiangco, Philippine television host and newscaster 24 Oras
- August 12
- August 13 – Daryl, American magician
- August 14 – Gillian Taylforth, English television actress
- August 17 – Richard Hilton, American businessman
- August 19
- August 20 – Agnes Chan, Hong Kong-born TV personality in Japan
- August 22
- August 24 – Mike Huckabee, American politician, former Governor and 2008 Presidential candidate
- August 27
- August 30 –
- August 31
- September 1
- September 2
- September 4 – Hiroshi Izawa, Japanese actor
- September 6 – Raymond Benson, American author
- September 7 – Efim Zelmanov, Russian mathematician
- September 9 – John Kricfalusi, Canadian cartoonist
- September 12 – Peter Scolari, American actor and comedian
- September 15
- September 16
- September 17 – Charles Martinet, American voice-actor
- September 19 – Richard Burmer, American composer, sound designer and musician (d. 2006)
- September 21 – Richard Hieb, American astronaut
- September 24 – Shinbo Nomura, Japanese manga artist
- September 25 – Karl-Heinz Rummenigge, German football player
- September 28 – Stéphane Dion, Canadian politician
- November 2 – Chris Burnett, American saxophone player, composer, veteran of US military jazz bands and band leader
- November 3
- November 4 – Moulana Ghousavi Shah, Sufi teacher and author, Secretary General of The Conference of World Religions
- November 4 – Matti Vanhanen, Prime Minister of Finland
- November 5
- November 6 – Maria Shriver, American television journalist, host; First Lady of California
- November 7 – Detlef Ultsch, German judo athlete
- November 9 – Karen Dotrice, Guernsey-born child actress
- November 10 – Roland Emmerich, German film director
- November 11 – Jigme Singye Wangchuck, King of Bhutan
- November 13 – Whoopi Goldberg, American actress and comedienne
- November 14 – Koichi Nakano, Japanese bicycle racer
- November 17 – Peter Cox, English singer-songwriter (Go West)
- November 19 – Dianne de Leeuw, Dutch figure skater
- November 20 – Ray Ozzie, American computer programmer
- November 21
- November 22 – George Alagiah, Ceylonese-born British newsreader, journalist and television news presenter
- November 23
- November 24 – Sir Ian Botham, English cricketer
- November 25 – Bruno Tonioli, film, music video and theater choreographer
- November 26 – Tracy Hickman, American author
- November 27 – Bill Nye, American science presenter and public television host
- November 28 – Alessandro Altobelli, Italian football player
- November 29 – Howie Mandel, Canadian actor and game show host
- November 30
- January 1 – Shanti Swaroop Bhatnagar, Indian scientist (b. 1894)
- January 2 – José Antonio Remón Cantera, President of Panama (assassinated) (b. 1908)
- January 6 – Yevgeny Tarle, Soviet historian (b. 1874)
- January 11 – Rodolfo Graziani, Italian general (b. 1882)
- January 15
- January 18 – August Duesenberg, German-born American automobile manufacturer (b. 1879)
- January 20 – Robert P. T. Coffin, American poet (b. 1892)
- January 21 – Archie Hahn, American athlete (b. 1880)
- January 24 – Ira Hayes, U.S. Marine flag raiser on Iwo Jima (b. 1923)
- January 29 – Hans Hedtoft, Prime Minister of Denmark (b. 1903)
- January 31 – John Mott, American YMCA leader, recipient of the Nobel Peace Prize (b. 1865)
- November 1 – Dale Carnegie, American writer and lecturer (b. 1888)
- November 4 – Cy Young, American baseball player (Cleveland Spiders) and a member of the MLB Hall of Fame (b. 1867)
- November 5 – Maurice Utrillo, French artist (b. 1882)
- November 7 – Tom Powers, American actor (b. 1890)
- November 11 – Jerry Ross, American lyricist and composer (b. 1926)
- November 12 – Alfréd Hajós, Hungarian swimmer and architect (b. 1878)
- November 13 – Moshe Pessach, chief rabbi of Volos (b. 1869)
- November 14 – Robert E. Sherwood, American playwright (b. 1896)
- November 15 – Lloyd Bacon, American actor and director (b. 1889)
- November 22 – Shemp Howard, American actor and comedian (The Three Stooges) (b. 1895)
- November 27 – Arthur Honegger, French-born Swiss composer (b. 1892)
- ↑ "Strömsund Bridge (1955)". Structurae. Retrieved October 2, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>