- Mar 1 Cameron Argetsinger, American auto racing executive (created Watkins Glen Grand Prix Race Course; F1 US Grand Prix 1961-80), born in Youngstown, Ohio (d. 2008)
- Mar 1 Jack Clayton, English film director (The Great Gatsby), born in Brighton, England (d. 1995)
- Mar 1 Richard Wilbur, 2nd US Poet Laureate (Ceremony, Walking to Sleep), born in New York City (d. 2017)
- Mar 1 Terrence Cooke, American Roman Catholic Cardinal, Archbishop of New York, born in New York City (d. 1983)
- Mar 2 Norman T. Hatch, American oscar-winning marine cinematographer during WWII (With the Marines at Tarawa), born in Boston (d. 2017)
- Mar 2 Robert Simpson, British classical composer, and broadcaster (BBC), born in Leamington, Warwickshire, England (d. 1997)
- Mar 2 Wilhelm Büsing, German equestrian (Olympic silver team eventing, bronze Individual eventing 1952) and coach (Olympics 1956, 60, 64), born in Jade, Germany (d. 2023)
- Mar 3 Diana Barrymore, American actress (Nightmare, Lady Courageous, Fired Wife), born in New York City (d. 1960)
- Mar 4 Dinny Pails, Australian tennis player (Australian C'ship 1947), born in Nottingham, England (d. 1986)
- Mar 4 Halim El-Dabh, Egyptian-American pianist, darabukha drummer, and composer (Martha Graham ballet scores), born in Cairo, Egypt (d. 2017)
- Mar 4 Joan Greenwood, British actress and director (Kind Hearts and Coronets, Amorous Mr Prawn), born in London, England (d. 1987)
- Mar 5 Berkley Bedell, American politician (Rep-D-IA, 1975-87), born in Spirit Lake, Iowa (d. 2019)
- Mar 5 Elmer Valo, American baseball outfielder (one of only 4, four-decade MLB players 1939-61; Philadelphia, KC Athletics), born in Rybník Czechoslovakia (d. 1998)
- Mar 6 Julius Rudel, Austrian-American conductor (NYC Opera, 1944-79), born in Vienna, Austria (d. 2014)
- Mar 6 Oliver Wright, British diplomat, UK Ambassador to Germany and the US, born in London, England (d. 2009) [1]
- Mar 6 Ross Hunter, American film producer (Airport, Madame X, Pillow Talk), born in Cleveland, Ohio (d. 1996) date of birth disputed)
Alan Hale Jr. (1921-1990)
Mar 8 American actor (Skipper-Gilligan's Island), born in Los Angeles, California
- Mar 8 Egbert George "Pete" Pitterson, Jamaican-British jazz trumpeter, born in Kingston, Jamaica, British West Indies (d. 1994)
- Mar 9 Carl Betz, American actor (The Donna Reed Show; Love of Life), born in Pittsburgh, Pennsylvania (d. 1978)
- Mar 9 Dimitris Horn, Greek actor (A Girl in Black), born in Athens, Greece (d. 1998)
- Mar 10 Cecil "Cec" Linder, Polish-Canadian actor (Goldfinger, Quatermass and the Pit), born in Galicia, Poland (d. 1992)
- Mar 10 Paul Coates, American columnist (Tonight! America After Dark), born in New York City (d. 1968)
- Mar 11 Astor Piazzolla, Argentinian bandoneon player, and composer (Tango Nuevo), born in Mar del Plata, Argentina (d. 1992)
- Mar 11 Frank Harary, American mathematician (d. 2005)
- Mar 12 (Giovanni) "Gianni" Agnelli, Italian industrialist, executive (President of Fiat Automobiles, 1966-96), and Italian Senator-for-life (1991-2003), born in Turin, Italy (d. 2003)
- Mar 12 Gordon MacRae, American singer and actor (Oklahoma!; Carousel), born in East Orange, New Jersey (d. 1986)
- Mar 12 Max de Metz, Dutch publisher and translator (d. 1993)
- Mar 12 Ralph Shapey, American composer (Fantasy; Rituals), born in Philadelphia, Pennsylvania (d. 2002)
- Mar 12 Ülo Jõgi, Estonian freedom fighter (d. 2007)
- Mar 13 Al Jaffee, American comic strip cartoonist and illustrator (MAD Magazine, 1955-2020), born in Savannah, Georgia (d. 2023) [1]
- Mar 13 Carlo Prosperi, Italian composer, born in Florence, Italy (d. 1990)
- Mar 13 Cyril Poole, English cricket batsman (3 Tests, 2 x 50; Nottinghamshire CCC), born in Mansfield, England (d. 1996)
- Mar 14 Frank Ottersen, Norwegian jazz violinist and saxophonist (Ding, Dong, Dang), born in Oslo, Norway (d. 1971)
- Mar 14 Lis Hartel, Danish equestrian dressage (Olympic silver 1952, 56; permanently paralyzed her below her knees from polio), born in Hellerup, Denmark (d. 2009)
- Mar 14 S. Truett Cathy, American businessman (founder of Chick-fil-A), born in Eatonton, Georgia (d. 2014)
- Mar 15 Madelyn Pugh, American television writer (I Love Lucy), born in Indianapolis, Indiana (d. 2011)
- Mar 15 Stafford Smythe, Canadian NHL executive (President Toronto Maple Leafs 1961–69, 1970-71), born in Toronto, Ontario (d. 1971)
- Mar 16 Anne Truitt [Anne Dean], American sculptor, born in Baltimore, Maryland (d. 2004)
- Mar 16 Fahd bin Abdulaziz Al Saud, King of Saudi Arabia (1982-2005), born in Riyadh, Sultanate of Nejd (d. 2005)
- Mar 17 Donald Barron, Scottish accountant and CEO (Midland Bank), born in Gorebridge, Midlothian, Scotland (d. 2015)
- Mar 17 Mick Harvey, Australian cricketer (in Newcastle Brother of Neil Test umpire), born in Newcastle, Australia (d. 2016)
- Mar 19 Harry Babasin, American jazz bassist and cellist (Dodo Marmarosa Trio), and archivist (Los Angeles Theaseum), born in Dallas, Texas (d. 1988)
- Mar 19 Robert McFerrin, Sr., American operatic baritone (Metropolitan Opera, 1955-58; singing voice for Sidney Poitier in film "Porgy and Bess"), born in Marianna, Arkansas (d. 2006) [1]
- Mar 19 Tommy Cooper, British comedian and magician (d. 1984)
- Mar 20 Amadou-Mahtar M'Bow, Senegalese UNESCO Director General UNESCO (1974-87), born in Dakar, French West Africa
- Mar 20 Primož Ramovš, Slovenian avant-garde composer (Za Harmoniko; Tryptychon), pedagogue, and library director (Slovenian Academy of Sciences and Arts, 1945-87), born in Ljubljana, Kingdom of Serbs, Croats and Slovenes (d. 1999)
- Mar 21 Abdul Salam Arif, Iraqi politician and President of Iraq (1963-66), born in Baghdad, Mandatory Iraq (d. 1966)
- Mar 21 Antony Hopkins [Reynolds], British composer, pianist, conductor (Intimate Opera Company, 1954-62), writer, and radio broadcaster (Talking About Music, 1954-92), born in London, England (d. 2014)
- Mar 21 Arthur Grumiaux, Belgian concert violinist, born in Villers-Perwin, Belgium (d. 1986)
- Mar 21 Joe Sutter, American engineer and head of the Boeing 747 program, born in Seattle, Washington (d. 2016)
- Mar 21 Logan Ramsey, American actor (Head, Joy Sticks, Say Yes), born in Long Beach, California (d. 2000)
- Mar 22 Saturnino "Nino" Manfredi, Italian actor (Between Miracles), born in Castro dei Volsci, Italy (d. 2004)
- Mar 22 Wilhelmus Norbert Schmelzer, Dutch foreign minister (KVP), born in Rotterdam, Netherlands (d. 2008)
- Mar 23 Donald Campbell, English boat and land racer (world land and water records 1964; only person to complete in same year), born in Kingston upon Thames, England (d. 1967)
- Mar 23 Ian Todd, English surgeon, President of the Royal College of Surgeons (1986-89), born in London, England (d. 2015)
- Mar 24 Sir Wilson Harris, Guyanese author (Palace of the Peacock:; Jonestown; The Ghost of Memory), born in New Amsterdam, British Guiana (d. 2018)
- Mar 25 Alexandra of Greece and Denmark, Queen of Yugoslavia (d. 1993)
- Mar 25 Nancy Kelly, American child actress and model (The Bad Seed, Double Exposure, Jesse James), born in Lowell, Massachusetts (d. 1995)
Simone Signoret (1921-1985)
Mar 25 German-French BAFTA, Emmy, and Academy Award- winning actress (Room at Top; Diabolique), born in Wiesbaden, Germany
- Mar 26 George Jefferson, English engineer who oversaw privatisation of British Telecom, born in Kent, England (d. 2012) [1]
- Mar 26 Joe Loco [José Esteves, Jr], American Latin jazz pianist and arranger, born in New York City (d. 1988) [some sources give day as 27th]
- Mar 27 Harold Nicholas, American dancer known as one of the world's greatest dancers (Nicholas Brothers), born in Winston-Salem, North Carolina (d. 2000)
- Mar 27 Tom Bevill, American Democratic fifteen-term U.S. congressman, born in Townley, Alabama (d. 2005)
- Mar 28 Dirk Bogarde [Derek van den Bogaerde] British writer and actor (Death in Venice, Servant), born in London, England (d. 1999)
- Mar 29 Sam Loxton, Australian cricket batsman (12 Tests, 1 x 100, HS 101; Victoria; National team selector 1970-81), born in Melbourne, Australia (d. 2011)
- Mar 30 Elizabeth Sutherland, Countess of Sunderland, Scottish aristocrat, head of Clan Sunderland, born in London, England (d. 2019)
- Mar 30 Kan Ishii, Japanese composer (Marimo), born in Tokyo, Japan (d. 2009)
- Mar 30 Oto Ferenczy, Slovak composer, born in Brezovica, Kingdom of Serbs, Croats and Slovenes (now Kosovo) (d. 2000)
- Mar 31 Lowell Fulson, Choctaw-Cherokee-American blues guitarist and songwriter (“3 O’Clock Blues”; “Reconsider Baby”), born in Atoka, Oklahoma (d. 1999)
About March 1921
How Old? 103 years old
Generation: Greatest Generation
Leap Year: No
Year of the Rabbit
Year of the Dragon
Year of the Snake
Year of the Horse
Year of the Goat/Sheep
Year of the Monkey