FND Awareness Day in Canada (Functional Neurological Disorder [FND]/Conversion Disorder [CD])
Jefferson's Birthday (United States)
Katyn Memorial Day in Poland
Nanakshahi New Year, first day of the month of Chet (Sikhism)
National Dog Bite Prevention Week in US (the second full week of April )
National Peach Cobbler Day in USA
Påskedag or Easter Monday in Norway
Scrabble Day (April 13th is the birthday of Alfred Butts, the inventor of the Scrabble game)
1976 – The United States Treasury Department reintroduces the two-dollar bill as a Federal Reserve Note on Thomas Jefferson's 233rd birthday as part of the United States Bicentennial celebration.
1974 – Western Union (in cooperation with NASA and Hughes Aircraft) launches the United States' first commercial geosynchronous communications satellite, Westar 1.
1964 – At the Academy Awards, Sidney Poitier becomes the first African-American male to win the Best Actor award for the 1963 film Lilies of the Field.
1960 – The United States launches Transit 1-B, the world's first satellite navigation system.
1943 – World War II: The discovery of mass graves of Polish prisoners of war killed by Soviet forces in the Katyń Forest Massacre is announced, causing a diplomatic rift between the Polish government-in-exile in London from the Soviet Union, which denies responsibility.
1902 – James C. Penney opens his first store in Kemmerer, Wyoming.
1873 – The Colfax massacre, in which more than 60 African Americans are murdered, takes place.
1870 – The New York City Metropolitan Museum of Art is founded.
1865 – American Civil War: Raleigh, North Carolina is occupied by Union Forces.
1861 – American Civil War: Fort Sumter surrenders to Confederate forces.
1777 – American Revolutionary War: American forces are ambushed and defeated in the Battle of Bound Brook, New Jersey.
1613 – Samuel Argall captures Native American princess Pocahontas in Passapatanzy, Virginia to ransom her for some English prisoners held by her father; she is brought to Henricus as hostage.
1993 – Tony Wroten, American basketball player
1991 – Josh Gordon, American football player
1989 – Ryan Bailey, American sprinter
1988 – Allison Williams, American actress and singer
1987 – Allison Weiss, American singer-songwriter
1987 – Brandon Hardesty, American actor, director, producer, and screenwriter
1986 – Lorenzo Cain, American baseball player
1986 – Michael Bingham, American-English sprinter
1983 – Hunter Pence, American baseball player
1982 – Nellie McKay, British-American singer-songwriter, musician, and actress
1981 – Nat Borchers, American soccer player
1980 – Colleen Clinkenbeard, American voice actress, director, producer, and screenwriter
1980 – Quentin Richardson, American basketball player
1979 – Baron Davis, American basketball player
1979 – Meghann Shaughnessy, American tennis player
1978 – Keydrick Vincent, American football player
1976 – Glenn Howerton, American actor, producer, and screenwriter
1976 – Jonathan Brandis, American actor (d. 2003)
1976 – Patrik Eliáš, Czech-American ice hockey player
1972 – Aaron Lewis, American singer-songwriter and guitarist
1971 – Bo Outlaw, American basketball player
1970 – Monty Brown, American football player and wrestler
1970 – Ricardo Rincón, Mexican-American baseball player
1970 – Ricky Schroder, American actor
1968 – Ted Washington, American football player
1967 – Dana Barros, American basketball player, coach, and sportscaster
1967 – Michael Eisen, American biologist and academic
1967 – Olga Tañón, Puerto Rican-American singer-songwriter
1966 – Marc Ford, American guitarist, songwriter, and producer
1964 – Davis Love III, American golfer and sportscaster
1964 – John Swinney, Scottish businessman and politician, Deputy First Minister of Scotland
1962 – Hillel Slovak, Israeli-American guitarist (d. 1988)
1961 – Hiro Yamamoto, American bass player and songwriter
1960 – Bob Casey, Jr., American lawyer and politician, senior senator of Pennsylvania
1957 – Amy Goodman, American journalist and author
1957 – Saundra Santiago, American actress
1956 – Edward Forbes Smiley III, American art thief and map dealer
1955 – Louis Johnson, American bass player and producer (d. 2015)
1955 – Steve Camp, American singer-songwriter and guitarist
1954 – Jimmy Destri, American keyboard player and songwriter
1952 – Sam Bush, American mandolin player
1951 – Max Weinberg, American drummer
1951 – Peabo Bryson, American singer-songwriter and producer
1950 – Ron Perlman, American actor
1949 – Christopher Hitchens, English-American essayist, literary critic, and journalist (d. 2011)
1947 – Rae Armantrout, American poet and academic
1946 – Al Green, American singer-songwriter, producer, and pastor
1945 – Bob Kalsu, American football player and lieutenant (d. 1970)
1945 – Ed Caruthers, American high jumper
1945 – Lowell George, American singer-songwriter, guitarist, and producer (d. 1979)
1945 – Tony Dow, American actor
1944 – Charles Burnett, American actor, director, producer, and screenwriter
1944 – Jack Casady, American bass guitarist (Jefferson Airplane)
1944 – Susan Davis, Russian-American social worker and politician
1943 – Billy Kidd, American skier
1942 – Bill Conti, American composer and conductor
1941 – Michael Stuart Brown, American geneticist and academic, Nobel Prize laureate
1940 – Lester Chambers, American singer and musician (The Chambers Brothers)
1940 – Max Mosley, English race car driver and engineer, co-founded March Engineering, former president of the FIA