International Workers' Day or Labour Day (International), and its related observances: - Earliest day on which Labour Day can fall, while May 7 is the latest; celebrated on the first Monday of May. (Barbados, Dominica)
International Workers' Day or Labour Day (International), and its related observances: - Law Day (United States), formerly intended to counterbalance the celebration of Labour Day. (United States)
International Workers' Day or Labour Day (International), and its related observances: - Loyalty Day, formerly intended to counterbalance the celebration of Labour Day. (United States)
Majówka (is a spring festival celebrated throughout Europe)
May Day (beginning of Summer) observances in the Northern hemisphere (see April 30): - Earliest day on which Beltane can fall, while May 7 is the latest; celebrated on the first Monday in May. (Ireland, Scotland)
Vision Health Month in Canada (also Ankylosing Spondylitis; Awareness Month; Bladder Cancer Awareness Month; Brain Tumour Awareness Month; Celiac Awareness Month; Hemochromatosis Awareness Month; Hypertension Awareness Month; National Physiotherapy Month)
2002 – OpenOffice.org released version 1.0, the first stable version of the software.
1990 – The former Philippine Episcopal Church (supervised by the Episcopal Church of the United States of America) is granted full autonomy and raised to the status of an Autocephalous Anglican Province and renamed the Episcopal Church in the Philippines.
1989 – Disney-MGM Studios opens at Walt Disney World near Orlando, Florida, United States.
1978 – Japan's Naomi Uemura, travelling by dog sled, becomes the first person to reach the North Pole alone.
1970 – Protests erupt following the announcement by Richard Nixon that American and South Vietnamese forces would attack Vietnamese communists in a Cambodian Campaign.
1956 – A doctor in Japan reports an "epidemic of an unknown disease of the central nervous system", marking the official discovery of Minamata disease.
1950 – Guam is organized as a United States commonwealth.
1927 – The Union Labor Life Insurance Company is founded by the American Federation of Labor.
1925 – The All-China Federation of Trade Unions is officially founded. Today it is the largest trade union in the world, with 134 million members.
1900 – The Scofield Mine disaster kills over 200 men in Scofield, Utah in what is to date the fifth-worst mining accident in United States history.
1898 – Spanish–American War: Battle of Manila Bay: The United States Navy destroys the Spanish Pacific fleet in the first major battle of the war.
1894 – Coxey's Army, the first significant American protest march, arrives in Washington, D.C.
1886 – Rallies are held throughout the United States demanding the eight-hour work day, culminating in the Haymarket affair in Chicago, in commemoration of which May 1 is celebrated as International Workers' Day in many countries.
1884 – Moses Fleetwood Walker becomes the first black person to play in a professional baseball game in the United States.
1884 – Proclamation of the demand for eight-hour workday in the United States.
1866 – The Memphis Race Riots begin. In three days time, 46 blacks and two whites were killed. Reports of the atrocities influenced passage of the Fourteenth Amendment to the United States Constitution.
1863 – American Civil War: The Battle of Chancellorsville begins.
1862 – American Civil War: The Union Army completes its capture of New Orleans.
1844 – Hong Kong Police Force, the world's second modern police force and Asia's first, is established.
1840 – The Penny Black, the first official adhesive postage stamp, is issued in the United Kingdom.
1786 – In Vienna, Austria, Mozart's opera The Marriage of Figaro is performed for the first time.
1778 – American Revolution: The Battle of Crooked Billet begins in Hatboro, Pennsylvania.
2003 – Lizzy Greene, American actress
1992 – Bradley Roby, American football player
1990 – Scooter Gennett, American baseball player
1987 – Amir Johnson, American basketball player
1984 – David Backes, American ice hockey player
1984 – Patrick Eaves, American ice hockey player
1983 – Human Tornado, American wrestler
1981 – Wes Welker, American football player
1980 – Jay Reatard, American singer-songwriter and guitarist (d. 2010)
1978 – James Badge Dale, American actor
1975 – Austin Croshere, American basketball player and sportscaster
1972 – Julie Benz, American actress
1971 – Ethan Albright, American football player
1969 – Billy Owens, American basketball player
1969 – Wes Anderson, American director, producer, and screenwriter
1968 – D'arcy Wretzky, American bass player and singer (Smashing Pumpkins)
1967 – Tim McGraw, American singer-songwriter and actor
1962 – Ted Sundquist, American football player, coach, and manager
1961 – Marilyn Milian, American judge
1960 – Steve Cauthen, American jockey and sportscaster
1956 – Phil Foglio, American illustrator
1955 – Martin O'Donnell, American composer
1955 – Ray Searage, American baseball player and coach
1954 – Joel Rosenberg, Canadian-American author and activist (d. 2011)
1954 – Ray Parker, Jr., American singer-songwriter, guitarist, and producer
1953 – Glen Ballard, American songwriter and producer
1951 – Sally Mann, American photographer
1950 – Dann Florek, American actor and director
1949 – Paul Teutul, Sr., American motorcycle designer, co-founded Orange County Choppers
1948 – Patricia Hill Collins, American sociologist and scholar
1947 – Jacob Bekenstein, Mexican-born Israeli-American theoretical physicist (d. 2015)
1945 – Carson Whitsett, American keyboard player, songwriter, and producer (d. 2007)
1945 – Rita Coolidge, American singer-songwriter
1939 – Judy Collins, American singer-songwriter and guitarist
1934 – Shirley Horn, American singer and pianist (d. 2005)
1930 – Little Walter Jacobs, American blues harp player and singer (d. 1968)
1930 – Ollie Matson, American sprinter and football player (d. 2011)
1928 – Sonny James, American singer-songwriter and guitarist (d. 2016)
1926 – Peter Lax, Hungarian-American mathematician and academic
1925 – Chuck Bednarik, American lieutenant and football player (d. 2015)
1925 – Scott Carpenter, American commander, pilot, and astronaut (d. 2013)
1924 – Evelyn Boyd Granville, American mathematician, computer scientist, and academic
1924 – Terry Southern, American novelist, essayist, and screenwriter (d. 1995)
1923 – Joseph Heller, American novelist, short story writer, and playwright (d. 1999)
1919 – Dan O'Herlihy, Irish-American actor (d. 2005)
1918 – Jack Paar, American comedian, author and talk show host (d. 2004)
1917 – John Beradino, American baseball player and actor (d. 1996)
1916 – Glenn Ford, Canadian-American actor and producer (d. 2006)
1913 – Louis Nye, American actor (d. 2005)
1910 – J. Allen Hynek, American astronomer and ufologist (d. 1986)
1910 – Raya Dunayevskaya, Ukrainian-American philosopher and activist (d. 1987)
1908 – Morris Kline, American mathematician and academic (d. 1992)
1907 – Hayes Alvis, American bassist (d. 1972)
1907 – Kate Smith, American singer and actress (d. 1986)
1905 – Henry Koster, German-American director, producer, and screenwriter (d. 1988)
1901 – Heinz Eric Roemheld, American pianist, composer, and conductor (d. 1985)
1901 – Sterling Allen Brown, American poet, academic, and critic (d. 1989)
1896 – J. Lawton Collins, American general (d. 1987)
1896 – Mark W. Clark, American general (d. 1984)
1891 – Lillian Estelle Fisher, American historian of Spanish America (d. 1988)
1885 – Ralph Stackpole, American sculptor and painter (d. 1973)
1875 – Dave Hall, American runner (d. 1972)
1874 – Romaine Brooks, American-French painter and illustrator (d. 1970)
1864 – Anna Jarvis, American founder of Mother's Day (d. 1948)
1855 – Cecilia Beaux, American painter and academic (d. 1942)
1853 – Jacob Mikhailovich Gordin, Jewish Ukrainian-American journalist, actor, and playwright (d. 1909)
1852 – Calamity Jane, American frontierswoman and professional scout (d. 1903)
1847 – Henry Demarest Lloyd, American journalist and politician (d. 1903)
1825 – George Inness, American painter and educator (d. 1894)
1764 – Benjamin Henry Latrobe, English-American architect, designed the United States Capitol (d. 1820)
1751 – Judith Sargent Murray, American poet and playwright (d. 1820)
1594 – John Haynes, English-American politician, 1st Governor of the Colony of Connecticut (d. 1653)
1579 – Wolphert Gerretse, Dutch-American farmer, co-founded New Netherland (d. 1662)
2015 – Grace Lee Whitney, American actress (b. 1930)