Joueurs MLB — O
50 joueurs de baseball MLB dont le nom de famille commence par O.
- O'Brien, Pete 1982–1993
- O'Day, Darren 2008–2022
- O'Day, Hank 1884–1890
- O'Doul, Lefty 1919–1934
- O'Farrell, Bob 1915–1935
- O'Malley, Walter
- O'Neil, Buck
- O'Neill, Paul 1985–2001
- O'Neill, Steve 1911–1928
- O'Neill, Tip 1883–1892
- O'Neill, Tyler 2018–
- O'Rourke, Jim 1872–1904
- Ochoa, Alex 1995–2002
- Odor, Rougned 2014–
- Odorizzi, Jake 2012–2022
- Oester, Ron 1978–1990
- Oglivie, Ben 1971–1986
- Ohtani, Shohei 2018–
- Ojeda, Bob 1980–1994
- Okajima, Hideki 2007–2013
- Olerud, John 1989–2005
- Oliva, Tony 1962–1976
- Oliver, Al 1968–1985
- Oliver, Joe 1989–2001
- Olson, Gregg 1988–2001
- Olson, Matt 2016–
- Ontiveros, Steve 1985–2000
- Ordonez, Magglio 1997–2011
- Ordonez, Rey 1996–2004
- Orosco, Jesse 1979–2003
- Orta, Jorge 1972–1987
- Ortiz, David 1997–2016
- Ortiz, Joey 2023–
- Ortiz, Russ 1998–2010
- Osuna, Al 1990–1996
- Osuna, Roberto 2015–2020
- Oswalt, Roy 2001–2013
- Otis, Amos 1967–1984
- Ott, Ed 1974–1981
- Ott, Mel 1926–1947
- Otto, Glenn 2021–2023
- Outman, James 2022–
- Overbay, Lyle 2001–2014
- Owchinko, Bob 1976–1986
- Owen, Marv 1931–1940
- Owen, Mickey 1937–1954
- Owen, Spike 1983–1995
- Owings, Chris 2013–
- Owings, Micah 2007–2012
- Ozuna, Marcell 2013–
