O |
| O'Bannon, Dan | Daniel Thomas O'Bannon | 30 Sep 1946 | St. Louis | Missouri | |
| O'Brien, Edmond | Edmond O'Brien | 10 Sep 1915 | New York | New York | |
| O'Brien, Margaret | Angela Maxine Heimburg | 15 Jan 1937 | San Diego | California | |
| O'Brien, Pat | William Joseph Patrick O'Brien | 11 Nov 1899 | Milwaukee | Wisconsin | |
| O'Brien, Richard | Richard Smith | 25 Mar 1942 | Cheltenham, Gloucestershire | | England |
| O'Brien, Tom | Thomas Patrick O'Brien | 12 Apr 1965 | Burbank | California | |
| O'Connell, Arthur | Arthur O'Connell | 29 Mar 1908 | New York | New York | |
| O'Connell, Jerry | Jeremiah O'Connell | 17 Feb 1974 | New York | New York | |
| O'Connor, Carroll | Carroll O'Connor | 2 Aug 1924 | Bronx | New York | |
| O'Connor, Donald | David Dixon O'Connor | 28 Aug 1925 | Chicago | Illinois | |
| O'Connor, Frances | Frances O'Connor | 12 Jun 1967 | Wantage, Oxfordshire | | England |
| O'Connor, Reneé | Evelyn Renee O'Connor | 15 Feb 1971 | Katy | Texas | |
| O'Connor, Una | Agnes Teresa McGlade | 23 Oct 1880 | Belfast | | Ireland |
| O'Donnell, Chris | Christopher Eugene O'Donnell | 26 Jun 1970 | Winnetka | Illinois | |
| O'Donnell, Rosie | Roseann O'Donnell | 21 Mar 1962 | Commack, Long Island | New York | |
| O'Hanlon, George | George O'Hanlon | 23 Nov 1912 | Brooklyn | New York | |
| O'Hara, Maureen | Maureen FitzSimons | 17 Aug 1920 | Ranelagh | Dublin | Ireland |
| O'Herlihy, Dan | Dan O'Herlihy | 1 May 1919 | Wexford | | Ireland |
| O'Keefe, Dennis | Edward Vance 'Bud' Flanagan | 29 Mar 1908 | Fort Madison | Iowa | |
| O'Keefe, Michael | Michael O'Keefe | 24 Apr 1955 | Mount Vernon | New York | |
| O'Malley, J. Pat | James Patrick O'Malley | 15 Mar 1901 | Burnley | | England |
| O'Neal, Patrick | Patrick O'Neal | 26 Sep 1927 | Ocala | Florida | |
| O'Neal, Ron | Ron O'Neal | 1 Sep 1937 | Utica | New York | |
| O'Neal, Ryan | Patrick Ryan O'Neal | 20 Apr 1941 | Los Angeles | California | |
| O'Neal, Shaquille | Shaquille Rashaun O'Neal | 6 Mar 1972 | Newark | New Jersey | |
| O'Neal, Tatum | Tatum Beatrice O'Neal | 5 Nov 1963 | Los Angeles | California | |
| O'Neill, Ed | Edward O'Neill | 12 Apr 1946 | Youngstown | Ohio | |
| O'Quinn, Terry | Terrance Quinn | 15 Jul 1952 | Newberry | Michigan | |
| O'Rourke, Heather | Heather Michele O'Rourke | 27 Dec 1975 | San Diego | California | |
| O'Sullivan, Maureen | Maureen Paul O'Sullivan | 17 May 1911 | Boyle | County Roscommon | Ireland |
| O'Toole, Annette | Annette Toole | 1 Apr 1954 | Houston | Texas | |
| O'Toole, Peter | Peter Seamus O'Toole | 2 Aug 1932 | Connemara | County Galway | Ireland |
| Oakie, Jack | Lewis Delaney Offield | 12 Nov 1903 | Sedalia | Missouri | |
| Oakland, Simon | Simon Oakland | 28 Aug 1915 | New York | New York | |
| Oates, Warren | Warren Oates | 5 Jul 1928 | Depoy | Kentucky | |
| Oberon, Merle | Estelle Merle O'Brien Thompson | 19 Feb 1911 | | | India |
| Ocasek, Ric | Richard Otcasek | 23 Mar 1949 | Baltimore | Maryland | |
| Ochs, Phil | Phil Ochs | 19 Dec 1940 | El Paso | Texas | |
| Oldman, Gary | Leonard Gary Oldman | 21 Mar 1958 | New Cross, London | | England |
| Olfson, Ken | Ken Olfson | 2 Apr 1937 | Boston | Massachusetts | |
| Olin, Lena | Lena Maria Jonna Olin | 22 Mar 1955 | Stockholm | | Sweden |
| Oliver, Barret | Barrett Spencer Oliver | 24 Aug 1973 | Los Angeles | California | |
| Oliver, Edna May | Edna May Nutter | 9 Nov 1883 | Malden | Massachusetts | |
| Olivier, Laurence | Laurence Kerr Olivier | 22 May 1907 | Dorking, Surrey | | England |
| Olsen, Merlin | Merlin Olsen | 15 Sep 1940 | Logan | Utah | |
| Olsen, Susan | Susan Marie Olsen | 14 Aug 1961 | Santa Monica | California | |
| Olson, Johnny | John Leonard Olson | 22 May 1910 | Windom | Minnesota | |
| Omarion | Omari Ishmael Grandberry | 12 Nov 1984 | Los Angeles | California | |
| Ono, Yoko | Yoko Ono | 18 Feb 1933 | Tokyo | | Japan |
| Orbach, Jerry | Jerome Bernard Orbach | 20 Oct 1935 | New York | New York | |
| Orlando, Tony | Michael Anthony Orlando Cassavitis | 3 Apr 1944 | New York | New York | |
| Ormond, Julia | Julia Karin Ormond | 4 Jan 1965 | Epsom, Surrey | | England |
| Orwell, George | Eric Arthur Blair | 25 Jun 1903 | Motihari | | India |
| Osbourne, Ozzy | John Michael Osbourne | 3 Dec 1948 | Birmingham | | England |
| Ose, Jay | Javen A. Ose | 6 Nov 1911 | | Michigan | |
| Osment, Haley Joel | Haley Joel Osment | 10 Apr 1988 | Los Angeles | California | |
| Osmond, Donny | Donald Clark Osmond | 9 Dec 1957 | Ogden | Utah | |
| Osmond, Jay | Jay Wesley Osmond | 2 Mar 1955 | Ogden | Utah | |
| Osmond, Jimmy | James Arthur Osmond | 16 Apr 1963 | Canoga Park | California | |
| Osmond, Marie | Olive Marie Osmond | 13 Oct 1959 | Ogden | Utah | |
| Osmond, Wayne | Melvin Wayne Osmond | 28 Aug 1951 | Ogden | Utah | |
| Otto, Miranda | Miranda Otto | 16 Dec 1967 | Brisbane | Queensland | Australia |
| Overton, Frank | Frank Overton | 12 Mar 1918 | Babylon | New York | |
| Owen, Reginald | John Reginald Owen | 5 Aug 1887 | Wheathampstead | | England |
| Owens, Buck | Alvis Edgar Owens, Jr. | 12 Aug 1929 | Sherman | Texas | |
| Owens, Gary | Gary Altman | 10 May 1936 | Mitchell | South Dakota | |
| Oz, Frank | Richard Frank Oznowicz | 25 May 1944 | Hereford | | England |