Baseball Players with Last Names Starting with O
418 Players
- Bold indicates active player and + indicates a Hall of Famer.
Mike O'Berry (1979-1985)
Billy O'Brien (1884-1890)
Bob O'Brien (1971-1971)
Buck O'Brien (1911-1913)
Charlie O'Brien (1985-2000)
Cinders O'Brien (1888-1891)
Dan O'Brien (1978-1979)
Darby O'Brien (1887-1892)
Dink O'Brien (1923-1923)
Eddie O'Brien (1953-1958)
George O'Brien (1915-1915)
Jack O'Brien (1882-1890)
Jack O'Brien (1899-1903)
John O'Brien (1884-1884)
John O'Brien (1891-1899)
Johnny O'Brien (1953-1959)
Pete O'Brien (1887-1890)
Pete O'Brien (1901-1907)
Pete O'Brien (1982-1993)
Peter O'Brien (2015-2019)
Ray O'Brien (1916-1916)
Riley O'Brien (2021-2024)
Syd O'Brien (1969-1972)
Tom O'Brien (1882-1890)
Tom O'Brien (1897-1900)
Tommy O'Brien (1943-1950)
Willie O'Bryant (1932-1932)
Danny O'Connell (1950-1962)
Jimmy O'Connell (1923-1924)
John O'Connell (1891-1902)
John O'Connell (1928-1929)
Pat O'Connell (1886-1886)
Andy O'Connor (1908-1908)
Brian O'Connor (2000-2000)
Dan O'Connor (1890-1890)
Frank O'Connor (1893-1893)
Jack O'Connor (1887-1910)
Jack O'Connor (1981-1987)
Johnny O'Connor (1916-1916)
Mike O'Connor (2006-2011)
Paddy O'Connor (1908-1918)
Darren O'Day (2008-2022)
Hank O'Day+ (1884-1890)
Ken O'Dea (1935-1946)
Paul O'Dea (1944-1945)
Billy O'Dell (1954-1967)
George O'Donnell (1954-1954)
Harry O'Donnell (1927-1927)
John O'Donnell (1884-1884)
John O'Donoghue (1963-1971)
John O'Donoghue (1993-1993)
Lefty O'Doul (1919-1934)
Bob O'Farrell (1915-1935)
Eric O'Flaherty (2006-2017)
Brian O'Grady (2019-2021)
Chris O'Grady (2017-2018)
Hal O'Hagan (1892-1902)
Greg O'Halloran (1994-1994)
Bill O'Hara (1909-1910)
Kid O'Hara (1904-1904)
Tom O'Hara (1906-1907)
Ryan O'Hearn (2018-2024)
Logan O'Hoppe (2022-2024)
O'Keefe (1922-1922)
Brian O'Keefe (2022-2023)
Charley O'Leary (1904-1934)
Dan O'Leary (1879-1884)
Troy O'Leary (1993-2003)
Jack O'Loughlin (2024-2024)
Patrick O'Loughlin (1883-1883)
Ryan O'Malley (2006-2006)
Shawn O'Malley (2014-2016)
Tom O'Malley (1982-1990)
Ollie O'Mara (1912-1919)
Eddie O'Meara (1895-1896)
Oran O'Neal (1925-1927)
Randy O'Neal (1984-1990)
Buck O'Neil+ (1937-1948)
Charles O'Neil (1921-1923)
Ed O'Neil (1890-1890)
Fancy O'Neil (1874-1874)
Hugh O'Neil (1875-1875)
John O'Neil (1899-1902)
John O'Neil (1946-1946)
Mickey O'Neil (1919-1927)
Dennis O'Neill (1893-1893)
Emmett O'Neill (1943-1946)
Fred O'Neill (1887-1887)
Harry O'Neill (1922-1923)
Harry O'Neill (1939-1939)
Jack O'Neill (1902-1906)
Jim O'Neill (1920-1923)
John O'Neill (1904-1906)
Mike O'Neill (1901-1907)
Paul O'Neill (1985-2001)
Peaches O'Neill (1904-1904)
Steve O'Neill (1911-1928)
Tip O'Neill (1883-1892)
Tyler O'Neill (2018-2024)
Don O'Riley (1969-1970)
O'Rourke (1872-1872)
Frank O'Rourke (1912-1931)
Jim O'Rourke+ (1872-1904)
Jim O'Rourke (1959-1959)
Jimmy O'Rourke (1908-1908)
Joe O'Rourke (1929-1929)
John O'Rourke (1879-1883)
Mike O'Rourke (1890-1890)
Patsy O'Rourke (1908-1908)
Ryan O'Rourke (2015-2019)
Tim O'Rourke (1890-1894)
Tom O'Rourke (1887-1890)
Sean O'Sullivan (2009-2016)
Denny O'Toole (1969-1973)
Jim O'Toole (1958-1967)
Marty O'Toole (1908-1914)
Rebel Oakes (1909-1915)
Charles Oakley (1940-1940)
Trevor Oaks (2018-2018)
Prince Oana (1934-1945)
Johnny Oates (1970-1981)
Sherman Obando (1993-1997)
Bailey Ober (2021-2024)
Henry Oberbeck (1883-1884)
Scott Oberg (2015-2019)
Brett Oberholtzer (2013-2016)
Ken Oberkfell (1977-1992)
Doc Oberlander (1888-1888)
Frank Oberlin (1906-1910)
Wes Obermueller (2002-2007)
Jim Obradovich (1978-1978)
Alex Ochoa (1995-2002)
Iván Ochoa (2008-2008)
Whitey Ock (1935-1935)
Walter Ockey (1944-1944)
Johnnie Oden (1927-1932)
Ted Odenwald (1921-1922)
Blue Moon Odom (1964-1976)
Dave Odom (1943-1943)
Heinie Odom (1925-1925)
Joseph Odom (2020-2021)
Sam Odom (1946-1946)
Rougned Odor (2014-2023)
Jake Odorizzi (2012-2022)
Fred Odwell (1904-1907)
Bryan Oelkers (1983-1986)
Trent Oeltjen (2009-2011)
Chuck Oertel (1958-1958)
Joe Oeschger (1914-1925)
Ron Oester (1978-1990)
José Offerman (1990-2005)
Rowland Office (1972-1983)
Mose Offutt (1925-1925)
Alexi Ogando (2010-2018)
Cristofer Ogando (2022-2022)
Nefi Ogando (2015-2016)
Curly Ogden (1922-1926)
Jack Ogden (1918-1932)
Chad Ogea (1994-1999)
Jim Oglesby (1936-1936)
Ben Oglivie (1971-1986)
Bruce Ogrodowski (1936-1937)
Joe Ogrodowski (1925-1925)
Seunghwan Oh (2016-2019)
Tomo Ohka (1999-2009)
Joe Ohl (1909-1909)
Ross Ohlendorf (2007-2016)
Mike Ohlman (2017-2017)
Will Ohman (2000-2012)
Kevin Ohme (2003-2003)
Shohei Ohtani (2018-2024)
Kirt Ojala (1997-1999)
Augie Ojeda (2000-2010)
Bob Ojeda (1980-1994)
Miguel Ojeda (2003-2006)
Hideki Okajima (2007-2013)
Steven Okert (2016-2024)
Chris Okey (2022-2023)
Frank Okrie (1920-1920)
Len Okrie (1948-1952)
Jim Olander (1991-1991)
Dave Oldfield (1883-1886)
Jimmy Oldham (1920-1923)
John Oldham (1956-1956)
Red Oldham (1914-1926)
Bob Oldis (1953-1963)
Rube Oldring (1905-1918)
John Olerud (1989-2005)
Frank Olin (1884-1885)
Steve Olin (1989-1992)
Jared Oliva (2020-2021)
José Oliva (1994-1995)
Tony Oliva+ (1962-1976)
Ed Olivares (1960-1961)
Edward Olivares (2020-2024)
Omar Olivares (1990-2001)
Al Oliver (1968-1985)
Andy Oliver (2010-2011)
Bob Oliver (1965-1975)
Darren Oliver (1993-2013)
Dave Oliver (1977-1977)
Gene Oliver (1959-1969)
Jim Oliver (1946-1946)
Joe Oliver (1989-2001)
John Oliver (1945-1945)
Martin Oliver (1930-1932)
Nate Oliver (1963-1969)
Tom Oliver (1930-1933)
Héctor Olivera (2015-2016)
Francisco Oliveras (1989-1992)
Lester Oliveros (2011-2014)
Chi-Chi Olivo (1961-1966)
Diomedes Olivo (1960-1963)
Miguel Olivo (2002-2014)
Adam Oller (2022-2024)
Jim Ollom (1966-1967)
Ray Olmedo (2003-2012)
Luis Olmo (1943-1951)
Edgar Olmos (2013-2015)
Fred Olmstead (1908-1911)
Al Olmsted (1980-1980)
Hank Olmsted (1905-1905)
Barney Olsen (1941-1941)
Kevin Olsen (2001-2003)
Ole Olsen (1922-1923)
Scott Olsen (2005-2010)
Vern Olsen (1939-1946)
Garrett Olson (2007-2012)
Greg Olson (1989-1993)
Gregg Olson (1988-2001)
Ivy Olson (1911-1924)
Karl Olson (1951-1957)
Marv Olson (1931-1933)
Matt Olson (2016-2024)
Reese Olson (2023-2024)
Ted Olson (1936-1938)
Tim Olson (2004-2005)
Tyler Olson (2015-2019)
Mike Olt (2012-2015)
Ed Olwine (1986-1988)
Omeada (1932-1932)
Brian Omogrosso (2012-2013)
Alejandro Oms (1923-1935)
Jorge Oña (2020-2020)
Logan Ondrusek (2010-2016)
Manuel Onis (1935-1935)
Eddie Onslow (1912-1927)
Jack Onslow (1912-1917)
Steve Ontiveros (1973-1980)
Steve Ontiveros (1985-2000)
José Oquendo (1983-1995)
Mike Oquist (1993-1999)
Tom Oran (1875-1875)
Orange (1928-1928)
Grady Orange (1925-1930)
Ernie Oravetz (1955-1956)
Luis Ordaz (1997-2006)
Tony Ordeñana (1943-1943)
Magglio Ordóñez (1997-2011)
Rey Ordóñez (1996-2004)
Joe Orengo (1939-1945)
Nate Orf (2018-2020)
Kevin Orie (1997-2002)
Paulo Orlando (2015-2018)
Clarence Orme (1920-1920)
George Orme (1920-1920)
Jess Orndorff (1907-1907)
Jonathan Ornelas (2023-2024)
Eddie Oropesa (2001-2004)
Jesse Orosco (1979-2003)
Billy Orr (1913-1914)
Dave Orr (1883-1890)
Pete Orr (2005-2013)
Joe Orrell (1943-1945)
Ernie Orsatti (1927-1935)
John Orsino (1961-1967)
Joe Orsulak (1983-1997)
Kaleb Ort (2021-2024)
Jorge Orta (1972-1987)
Anthony Ortega (2009-2009)
Bill Ortega (2001-2001)
José Ortega (2012-2014)
Oliver Ortega (2021-2023)
Phil Ortega (1960-1969)
Rafael Ortega (2012-2024)
Frank Ortenzio (1973-1973)
Al Orth (1895-1909)
Bill Ortiz (1945-1945)
Danny Ortiz (2017-2017)
David Ortiz+ (1997-2016)
Héctor Ortiz (1998-2002)
Javier Ortiz (1990-1991)
Joe Ortiz (2013-2013)
Joey Ortiz (2023-2024)
José Ortiz (1969-1971)
José Ortiz (2000-2002)
Junior Ortiz (1982-1994)
Luis Ortiz (1993-1996)
Luis Ortiz (2018-2024)
Luis Ortiz (2022-2024)
Oliverio Ortiz (1944-1944)
Rafaelito Ortiz (1948-1948)
Ramón Ortiz (1999-2013)
Roberto Ortiz (1941-1950)
Russ Ortiz (1998-2010)
Daniel Ortmeier (2005-2008)
John Orton (1989-1993)
Chad Orvella (2005-2007)
Ossie Orwoll (1928-1929)
Eric Orze (2024-2024)
Bob Osborn (1925-1931)
Dan Osborn (1975-1975)
Fred Osborn (1907-1909)
Bobo Osborne (1957-1963)
Donovan Osborne (1992-2004)
Fred Osborne (1890-1890)
Tiny Osborne (1922-1925)
Wayne Osborne (1935-1936)
Pat Osburn (1974-1975)
Charlie Osgood (1944-1944)
Josh Osich (2015-2021)
Keith Osik (1996-2005)
Dan Osinski (1962-1970)
Julius Osley (1937-1938)
Franquelis Osoria (2005-2008)
Harry Ostdiek (1904-1908)
Champ Osteen (1903-1909)
Claude Osteen (1957-1975)
Darrell Osteen (1965-1970)
Fred Ostendorf (1914-1914)
Bill Oster (1954-1954)
Red Ostergard (1921-1921)
Charlie Osterhout (1879-1879)
Fritz Ostermueller (1934-1948)
Jimmy Osting (2001-2002)
Brian Ostrosser (1973-1973)
Joe Ostrowski (1948-1952)
Johnny Ostrowski (1943-1950)
Al Osuna (1990-1996)
Antonio Osuna (1995-2005)
José Osuna (2017-2020)
Roberto Osuna (2015-2020)
Corey Oswalt (2018-2021)
Roy Oswalt (2001-2013)
Michel Otañez (2024-2024)
Willis Otáñez (1998-1999)
Dan Otero (2012-2019)
Reggie Otero (1945-1945)
Ricky Otero (1995-1997)
Bill Otey (1907-1911)
Amos Otis (1967-1984)
Bill Otis (1912-1912)
Harry Otis (1909-1909)
Akinori Otsuka (2004-2007)
Billy Ott (1962-1964)
Ed Ott (1974-1981)
Mel Ott+ (1926-1947)
Adam Ottavino (2010-2024)
Jim Otten (1974-1981)
John Otten (1895-1895)
Billy Otterson (1887-1887)
Dave Otto (1987-1994)
Glenn Otto (2021-2023)
Phil Ouellette (1986-1986)
Johnny Oulliber (1933-1933)
Guy Ousley (1931-1932)
Bill Outen (1933-1933)
Jimmy Outlaw (1937-1949)
James Outman (2022-2024)
Josh Outman (2008-2014)
Orval Overall (1905-1913)
Lyle Overbay (2001-2014)
Stubby Overmire (1943-1952)
Albert Overton (1932-1944)
Connor Overton (2021-2023)
Dillon Overton (2016-2017)
Mike Overy (1976-1976)
Johan Oviedo (2020-2023)
Juan Carlos Oviedo (2005-2014)
Luis Oviedo (2021-2021)
Ernie Ovitz (1911-1911)
Bob Owchinko (1976-1986)
Dave Owen (1983-1988)
Frank Owen (1901-1909)
Hunter Owen (2021-2021)
Larry Owen (1981-1988)
Marv Owen (1931-1940)
Mickey Owen (1937-1954)
Spike Owen (1983-1995)
Albert Owens (1930-1930)
Aubry Owens (1922-1925)
Dewitt Owens (1926-1930)
Eric Owens (1995-2003)
Henry Owens (2006-2007)
Henry Owens (2015-2016)
Jack Owens (1935-1935)
Jayhawk Owens (1993-1996)
Jerry Owens (2006-2009)
Jim Owens (1955-1967)
Judge Owens (1943-1943)
Oscar Owens (1922-1929)
Red Owens (1899-1905)
Roosevelt Owens (1934-1937)
Rudy Owens (2014-2014)
Smoky Owens (1938-1942)
Sylvester Owens (1937-1942)
Will Owens (1924-1933)
Yip Owens (1905-1915)
Chris Owings (2013-2023)
Micah Owings (2007-2012)
Rick Ownbey (1982-1986)
Henry Oxley (1884-1884)
Chris Oxspring (2005-2005)
Andy Oyler (1902-1902)
Ray Oyler (1965-1970)
Horace Ozmer (1923-1923)
Marcell Ozuna (2013-2024)
Pablo Ozuna (2000-2008)
Index of Letters