Simon Oakland (actor) -- Dead. Died August 29, 1983. Born August 28, 1915. Frequently played a cop, notably in West Side Story. IMDb
Warren Oates (actor) -- Dead. Heart attack. Died April 3, 1982. Born July 5, 1928. IMDb
Dan O'Bannon (screenwriter) -- Dead. Died December 17, 2009. Born June 30, 1946. Wrote and starred in Dark Star, wrote Alien and adapted Total Recall, died on the same day as Jennifer Jones. IMDb Obituary
Ken Ober (comic/host/producer) -- Dead. Suspected flu. Died November 15, 2009. Born July 3, 1957. Host of MTV's Remote Control, produced shows like Mind of Mencia. IMDb Obituary FindAGrave
Merle Oberon (actress) -- Dead. Died November 23, 1979. Born February 19, 1911. IMDb
Maureen O'Boyle (anchor) -- Alive. Born July 14, 1963. Extra!. IMDb
Hugh O'Brian (actor) -- Dead. Died September 5, 2016. Born April 19, 1925. Very busy TV actor in the '50s, '60s and '70s, starred as Wyatt Earp on TV. IBDB IMDb Obituary
Patrick O'Brian (author of sea-faring novels) --Dead. Old age. Died January 2, 2000. Born December 12, 1914. Wrote the very popular Aubrey-Maturin series.
Pat O'Brien (actor) -- Dead. Heart attack. Died October 15, 1983. Born November 11, 1899. American actor who invariably played Irishmen, frequently co-starred with Jimmy Cagney (Angels with Dirty Faces). IMDb FindAGrave
Phil Ochs (singer) -- Dead. Suicide. Died April 9, 1976. Born December 19, 1940. "Draft Dodger Rag" IMDb FindAGrave
Helen O'Connell (singer) -- Dead. Died September 9, 1993. Born May 23, 1920. Band singer, second wife of Frank De Vol. IMDb
Carroll O'Connor (actor) -- Dead. Heart attack. Died June 21, 2001. Born August 2, 1924. TV's In the Heat of the Night and All in the Family. IMDb
Donald O'Connor (actor/dancer) -- Dead. Heart failure. Died September 27, 2003. Born August 28, 1925. Cosmo in Singing in the Rain and later the friend of Francis the talking mule, he was in show business for 77 years. His family reports one of his deathbed quotes was "I'd like to thank the Academy for my lifetime achievement award that I will eventually get.." IMDb
Hugh O'Connor (actor) -- Dead. Suicide/drug addiction. Died March 28, 1995. Born April 7, 1962. IMDb
Anita O'Day (singer) -- Dead. Cardiac arrest. Died November 23, 2006. Born October 18, 1919. A singer for Gene Krupa, her career spanned almost 70 years, release an album when she was 86, died on the same day as Betty Comden. IMDb FindAGrave
Odetta (folksinger/activist) -- Dead. Heart disease/kidney failure. Died December 2, 2008. Born December 31, 1930. Blues/folksinger ("Take This Hammer") whose work influenced Harry Belafonte, Pete Seeger, Joan Baez and Bob Dylan, performed with Martin Luther King, died on the same day as Edward Rogers. IMDb Obituary
Michaela Odone (creative mother) -- Dead. Lung cancer. Died June 10, 2000. Born circa 1939. Her attempts to treat her fatally ill son inspired the movie Lorenzo's Oil (and her son has outlived her).
Michael O'Donoghue (comedy writer) -- Dead. Died November 8, 1994. Born January 5, 1940. Semi-regular on SNL. IMDb
andrew j. offutt (writer) -- Dead. Died April 30, 2013. Born August 16, 1934. Sword and Sorcery writer who wrote a number of Conan novels, but made most of his living by selling porn under many pseudonyms. Obituary
Lani O'Grady (actress) -- Dead. Uncertain (probably drugs & alcohol). Died September 25, 2001. Born October 2, 1954. Oldest sister on Eight Is Enough, in real life, the younger sister of My Three Sons's Don Grady. IMDb
Madalyn Murray O'Hair (activist) -- Missing. Likely murdered. Died August 28, 1995. Born April 13, 1919. Killed along with other family members; sucessfully fought racism and mandatory school prayer in the '50s and '60s.
Maureen O'Hara (actress) -- Dead. Died October 24, 2015. Born August 17, 1920. Wonderfully bold actress with Technicolor red hair, The Quiet Man and the original The Parent Trap IBDB IMDb Obituary
Michael O'Hare (Heart attack) -- Dead. Heart attack. Died September 28, 2012. Born May 6, 1952. Best-known for playing Jeffrey Sinclair in Babylon 5 IBDB IMDb
Daniel O'Herlihy (actor) -- Dead. Died February 17, 2005. Born May 1, 1919. Adventures of Robinson Crusoe, Robocop. IBDB IMDb Obituary
Norio Ohga (Sony president/opera singer) -- Dead. Multiple organ failure. Died April 23, 2011. Born January 29, 1930. Studied opera and later became the Sony executive who designed and promoted the CD. Obituary
Paul O'Keefe (actor) -- Alive. Born circa 1950. Ross on The Patty Duke Show. IMDb
Georgia O'Keeffe (artist) -- Dead. Died March 6, 1986. Born November 15, 1887. Landscape and floral painter who split her life between New York and New Mexico, died on the same day as Adolph Caesar. Obituary FindAGrave
Jack Oliver (geophysicist) -- Dead. Died January 5, 2011. Born September 26, 1923. Proved the theory of continental drift Obituary
Susan Oliver (actress/director/pilot) -- Dead. Cancer. Died May 10, 1990. Born February 13, 1937. Vina in the Star Trek pilot. IMDb
Sir Laurence Olivier (Shakespearean actor/director) -- Dead. Died July 11, 1989. Born May 22, 1907. Wuthering Heights, the original Slueth, won an Oscar for Hamlet, married to Vivien Leigh, later married to Joan Plowright. IBDB IMDb FindAGrave
Edward James Olmos (actor) -- Alive. Born February 24, 1947. Adama in the Battlestar Galactica remake, Stand and Deliver, the origami-making cop in Blade Runner. IMDb
Jack Olsen (writer) -- Dead. Heart attack. Died July 19, 2002. Born June 7, 1925. Former cop who turned to writing true crime books like Last Man Standing.
Johnny Olsen (game show announcer) -- Dead. Died October 12, 1985. Born May 22, 1910. IMDb
Merlin Olsen (football player/actor/sportscaster) -- Dead. Mesothelioma Died March 11, 2010. Born September 15. 1940. Los Angeles Rams tackle, football color commentator, Little House on the Prairie, died same year as Don Meredith. IMDb Obituary FindAGrave
Tillie Olsen (writer) -- Dead. Died January 1, 2007. Born January 14, 1912. Tell Me a Riddle. IMDb
Barbara Olson (political commentator, writer) -- Dead. Murdered by terrorists. Died September 11, 2001. Born December 27, 1955. Politically Incorrect, died on the same day as Berry Berenson and David Angell and Alice Trillin. Obituary
James Olson (actor) -- Alive. Born October 8, 1930. Dr. Hall in The Andromeda Strain. IMDb
Sydney Omarr (astrologer) -- Dead. Pneumonia/Multiple Sclerosis. Died January 2, 2003. Born August 5, 1926. Wrote columns, books and cast horoscopes for various celebrities.
Patrick O'Neal (actor) -- Dead. Cancer. Died September 9, 1994. Born September 26, 1927. IMDb
Ron O'Neal (actor) -- Dead. Cancer. Died January 14, 2004. Born September 1, 1937. Superfly, died on the same day as Uta Hagen. IMDb
Ryan O'Neal (actor) -- Alive. Born April 20, 1941. Love Story, Barry Lyndon, father of Tatum O'Neal. IMDb
Aristotle Onassis (shipping magnate) -- Dead. Pneumonia. Died March 15, 1975. Born September 21, 1906. Onw of the early jet-setters who became very famous after marrying Jacqueline Kennedy. IMDb
Jacqueline Bouvier Kennedy Onassis (editor/political spouse) -- Dead. Non-Hodgkins lymphoma. Died May 19, 1994. Born July 28, 1929. Photographer who married John Kennedy and brought glamour to the White House, she later married Aristotle Onassis and then had a successful career as a book editor. IMDb
Tip O'Neill (politician) -- Dead. Died January 5, 1994. Born December 9, 1912. Speaker of the House.
Ellison Onizuka (Challenger (STS-51L) astronaut) -- Dead. Shuttle explosion. Died January 28, 1986. Born June 24, 1946. Mission specialist for the Challenger.
Yoko Ono (avante garde artist, businesswoman) -- Alive. Born February 18, 1933. Married to John Lennon, Sean Lennon's mother. IMDb
Hiroo Onoda (stubborn soldier/cattle farmer) -- Dead. Died January 16, 2014. Born March 19, 1922. Japanese soldier who continued to fight WWII in the jungles of the Phillippines until he finally agreed to surrender in 1974. Died same day as Dave Madden and Russell Johnson and Ruth Duccini. Wikipedia Obituary
Jerry Orbach (actor) -- Dead. Prostate cancer. Died December 28, 2004. Born October 20, 1935. Law & Order, Baby's dad in Dirty Dancing, died on the same day as Susan Sontag. IBDB IMDb
Roy Orbison (musician) -- Dead. Heart attack. Died December 6, 1988. Born April 23, 1936. "Pretty Woman."
Heather O'Rourke (child actor) -- Dead. During emergency abdominal surgery. Died February 1, 1988. Born December 27, 1975. The youngest child in Poltergeist.
Benjamin Orr (singer/guitarist) -- Dead. Pancreatic cancer. Died October 3, 2000. Born August 9, 1947. Played with the Cars, lead singer for their hit "Drive"
Ozzy Osbourne (rocker) -- Not dead yet. Born December 3, 1948. Made a surprising comeback as a pop-culture icon after a "real life" show about his family premired in 2002. IMDb
Sharon Osbourne (unexpected TV star, rock manager) -- Alive. Born October 10, 1953. After managing Ozzy's career, she starred in the TV series about their lives, recovered from colon cancer. IMDb
Milo O'Shea (actor) -- Dead. Died April 2, 2013. Born June 2, 1926. Starred as Leopold Bloom in Ulysses and Friar Lawrence in Romeo and Juliet, many bit parts on TV from the '60s through the '90s, including The Golden Girls and The West Wing. Wikipedia IBDB IMDb Obituary
Alan Osmond (singer) -- Alive. Born June 22, 1949. The leader of the Osmond Brothers, is one of nine children, he has eight sons (who sing as The Osmonds-the Second Generation), has multiple sclerosis. IMDb
Donny Osmond (singer/actor) -- Alive. Born December 9, 1957. The second-youngest Osmond Brother, he co-hosted the Donny and Marie in the late '70s, starred in Joseph and the Amazing Technocolor Dreamcoat and played Gaston in Beauty and the Beast on Broadway, very popular in England, one of nine children, he has five sons and became a grandfather at 47 (to yet another boy). IBDB IMDb
Jay Osmond (singer) -- Alive. Born March 2, 1955. An Osmond Brother, is one of nine children, he has three sons. IMDb
Jimmy Osmond (singer) -- Alive. Born April 16, 1963. The youngest Osmond Brother, he owns the Osmond Family Theater in Branson, he has two sons and two daughters. IMDb
Ken Osmond (actor/cop) -- Alive. Born June 7, 1943. Always typecast as Eddie on Leave It To Beaver. IMDb
Marie Osmond (singer/actress) -- Alive. Born October 13, 1959. The sole Osmond sister, she co-hosted the Donny and Marie in the late '70s, performed in The King and I on Broadway, appeared on Dancing with the Stars, runs a dollmaking business, one of nine children, she has eight children. IBDB IMDb
Merrill Osmond (singer/writer) -- Alive. Born April 30, 1953. An Osmond Brother, he writes for television, he has six children. IMDb
Wayne Osmond (singer) -- Alive. Born August 28, 1951. An Osmond Brother, he has five children. IMDb
Maureen O'Sullivan (actress) -- Dead. Heart attack. Died June 22, 1998. Born May 17, 1911. Starred in old Tarzan movies, mother of Mia Farrow, acted with her in Hannah and Her Sisters. IMDb
Peter O'Toole (actor) -- Dead. Died December 14, 2013. Born August 2, 1932. Extremely talented actor in Lawrence of Arabia, Becket, A Lion in Winter, My Favorite Year, awarded an honorary Oscar in 2003, married to Sian Phillips for 20 years. Wikipedia IBDB IMDb Obituary FindAGrave
Buck Owens (singer) -- Dead. Died March 25, 2006. Born August 12, 1929. "Act Naturally," co-host of Hee-Haw, died hours after performing in his club, died on the same day as Richard Fleischer. IMDb FindAGrave
Gary Owens (announcer) -- Dead. Diabetes. Died February 12, 2015. Born May 10, 1936. Rowan and Martin's Laugh-In, many commercials and cartoons, inventor of the catchphrase "Beautiful Downtown Burbank." IMDb Obituary FindAGrave
Frank Oz (director/puppeteer) -- Alive. Born May 25, 1944. Directed In and Out, he's the voice of Miss Piggy, Animal and Yoda. IMDb