Skip to main content - O'Keefe, Michael 1955– (Michael Raymond O'Keefe)
- O'keeffe, Doug 1966–
- O'Kelley, Tricia 1968-
- O'Leary, Matt 1987- (Matthew O'Leary)
- O'Leary, William
- O'Loughlin, Alex 1975(?)-
- O'Malley, Mike 1969–
- O'Mara, Jason 1972- (Jason O'Meara)
- O'Meara, Jo 1979-
- O'nan, Stewart
- O'Neal, Jamie
- O'Neal, Peggy (Peggie O'Neal, Peggy O'Neil)
- O'Neal, Ryan 1941-
- O'Neal, Tatum 1963–
- O'Neill, Jennifer 1948(?)–
- O'Neill, Michael
- O'Ree, Willie 1935–
- O'Reilly, Michael
- O'Reilly, Robert 1950- (Bobby O'Reilly)
- O'Shaughnessey, Colleen 1971- (Colleen O'Shaughnessy)
