MLB Players with Last Names Starting with "O"
| Player | Pos | Height / Weight | Birth Date (Age) | College |
|---|---|---|---|---|
| Peter O'Brien | LF | 6' 4" / 235 lbs | Jul 15, 1990 (34) | Miami (FL) |
| Riley O'Brien STL | RP | 6' 4" / 180 lbs | Feb 6, 1995 (29) | College of Idaho |
| Darren O'Day | RP | 6' 4" / 220 lbs | Oct 22, 1982 (42) | Florida |
| Trennor O'Donnell BOS | SP | 6' 7" / 240 lbs | Jun 6, 2001 (23) | Ball State |
| Ethan O'Donnell CIN | OF | 6' 1" / 190 lbs | Mar 27, 2002 (22) | Virginia |
| Griff O'Ferrall BAL | IF | 6' 1" / 185 lbs | Feb 2, 2003 (21) | Virginia |
| Brian O'Grady | 1B | 6' 2" / 215 lbs | May 17, 1992 (32) | Rutgers |
| Jamal O'Guinn | LF | 6' 4" / 220 lbs | Jan 19, 1999 (25) | Southern California |
| Connor O'Halloran TOR | RP | 6' 2" / 190 lbs | Sep 1, 2002 (22) | Michigan |
| Ryan O'Hearn BAL | 1B | 6' 3" / 220 lbs | Jul 26, 1993 (31) | Sam Houston State |
| Logan O'Hoppe LAA | C | 6' 2" / 185 lbs | Feb 9, 2000 (24) | None |
| Brian O'Keefe KC | C | 6' 1" / 210 lbs | Jul 15, 1993 (31) | St. Joseph's (PA) |
| Jack O'Loughlin COL | SP | 6' 5" / 223 lbs | Mar 14, 2000 (24) | None |
| Tyler O'Neill | LF | 5' 11" / 200 lbs | Jun 22, 1995 (29) | None |
| Mike O'Neill DET | LF | 5' 9" / 170 lbs | Feb 12, 1988 (36) | Southern California |
| Matt O'Neill NYM | C | 6' 0" / 205 lbs | Aug 20, 1997 (27) | Pennsylvania |
| Dylan O'Rae MIL | SS | 5' 7" / 160 lbs | Feb 14, 2004 (20) | None |
| John O'Reilly | RP | 6' 5" / 195 lbs | Oct 4, 1995 (29) | Rutgers |
| Ryan O'Rourke | RP | 6' 3" / 230 lbs | Apr 30, 1988 (36) | Merrimack |
| Joey Oakie CLE | P | 6' 3" / 200 lbs | May 9, 2006 (18) | None |
| Trevor Oaks | SP | 6' 3" / 225 lbs | Mar 26, 1993 (31) | California Baptist |
| Bailey Ober MIN | SP | 6' 9" / 260 lbs | Jul 12, 1995 (29) | College of Charleston |
| Scott Oberg | RP | 6' 2" / 203 lbs | Mar 13, 1990 (34) | Connecticut |
| Brett Oberholtzer NYY | SP | 6' 1" / 225 lbs | Jul 1, 1989 (35) | Seminole State Junior College |
| Norberto Obeso | LF | 6' 0" / 175 lbs | Jul 9, 1995 (29) | None |
| Juan Obispo WSH | CF | 6' 0" / 180 lbs | May 9, 2006 (18) | None |
| Carlos Ocampo NYM | P | 6' 2" / 181 lbs | Sep 3, 1998 (26) | None |
| Yonathan Ochoa | RP | 6' 3" / 175 lbs | Oct 18, 2002 (22) | None |
| Luis Ochoa | P | 6' 0" / 170 lbs | Mar 4, 2004 (20) | None |
| Nelvis Ochoa BAL | RP | 5' 10" / 158 lbs | Jan 18, 2003 (21) | None |
| Carlos Ochoa MIA | P | 6' 2" / 185 lbs | Sep 23, 2006 (18) | None |
| Nehomar Ochoa Jr. HOU | CF | 6' 4" / 210 lbs | Jul 31, 2005 (19) | None |
| Nathaniel Ochoa Leyva WSH | 3B | 6' 4" / 215 lbs | Oct 15, 2003 (21) | None |
| Aaron Ochsenbein LAD | RP | 6' 3" / 225 lbs | Feb 29, 1996 (28) | Eastern Kentucky |
| Nathan Ocker | P | 6' 0" / 190 lbs | Dec 3, 1996 (27) | College of Charleston |
| Josh Ockimey | 1B | 6' 1" / 238 lbs | Oct 18, 1995 (29) | None |
| Yoiber Ocopio SD | C | 5' 10" / 175 lbs | Aug 24, 2004 (20) | None |
| Jacob Odle STL | RP | 6' 5" / 210 lbs | Nov 30, 2003 (20) | Orange Coast CC (CA) |
| Joseph Odom | C | 6' 2" / 215 lbs | Jan 9, 1992 (32) | Huntingdon College |
| Rougned Odor NYY | 2B | 5' 11" / 200 lbs | Feb 3, 1994 (30) | None |
| Rougned J Odor | SS | - / - | Oct 17, 1997 (27) | None |
| Jake Odorizzi | SP | 6' 2" / 190 lbs | Mar 27, 1990 (34) | None |
| Cristofer Ogando | RP | 6' 3" / 195 lbs | Oct 23, 1993 (31) | None |
| Adrian Ogando WSH | RP | 6' 2" / 190 lbs | Nov 20, 2003 (21) | None |
| Joan Ogando HOU | RP | 6' 1" / 179 lbs | May 23, 2004 (20) | None |
| Keshawn Ogans ATL | SS | 5' 9" / 180 lbs | Aug 26, 2001 (23) | California |
| Braeden Ogle | SP | 6' 2" / 170 lbs | Jul 30, 1997 (27) | None |
| Ryne Ogren BAL | 2B | 6' 1" / 180 lbs | Apr 11, 1997 (27) | Elon |
| Seung Hwan Oh | RP | 5' 10" / 205 lbs | Jul 15, 1982 (42) | None |
| Rafael Ohashi TOR | SP | 6' 1" / 185 lbs | Oct 8, 2002 (22) | None |
| Mike Ohlman | C | 6' 5" / 215 lbs | Dec 14, 1990 (33) | None |
| Shohei Ohtani LAD | DH | 6' 4" / 210 lbs | Jul 5, 1994 (30) | None |
| Michell Ojeda PIT | 2B | 6' 0" / 158 lbs | Jan 23, 2007 (17) | None |
| Miguel Ojeda Jr. | C | 6' 0" / 200 lbs | Jun 16, 2000 (24) | None |
| Steven Okert HOU | RP | 6' 2" / 202 lbs | Jul 9, 1991 (33) | Oklahoma |
| Chris Okey LAD | C | 5' 11" / 200 lbs | Dec 29, 1994 (29) | Clemson |
| Jon Olczak | RP | 6' 0" / 180 lbs | Nov 14, 1993 (31) | North Carolina State |
| Wyatt Olds BOS | SP | 6' 0" / 183 lbs | Aug 5, 1999 (25) | Oklahoma |
| Peyton Olejnik LAA | RP | 6' 11" / 210 lbs | Dec 4, 2002 (21) | Miami Ohio |
| Jared Oliva SEA | CF | 6' 2" / 200 lbs | Nov 27, 1995 (28) | Arizona |
| Ricardo Olivar MIN | C | 5' 10" / 176 lbs | Aug 10, 2001 (23) | None |
| Edward Olivares | RF | 6' 2" / 190 lbs | Mar 6, 1996 (28) | None |
| Pablo Olivares | CF | 6' 0" / 160 lbs | Jan 27, 1998 (26) | None |
| Helcris Olivarez BOS | SP | 6' 2" / 192 lbs | Aug 8, 2000 (24) | None |
| Connor Oliver PIT | RP | 6' 2" / 170 lbs | May 26, 2001 (23) | Miami (OH) |
| Deyni Olivero | SP | 6' 1" / 165 lbs | Jan 7, 1998 (26) | None |
| Christian Olivo CHC | SS | 5' 11" / 168 lbs | Oct 29, 2003 (21) | None |
| Adam Oller | SP | 6' 4" / 225 lbs | Oct 17, 1994 (30) | Northwestern State |
| Juan Olmos KC | C | 6' 2" / 175 lbs | Nov 22, 2004 (20) | None |
| Johnny Olmstead MIA | SS | 6' 2" / 185 lbs | Jul 10, 2000 (24) | Southern California |
| Joe Olsavsky ATL | SS | 6' 1" / 195 lbs | Mar 29, 2002 (22) | John Carroll |
| Mat Olsen SF | RP | 5' 11" / 185 lbs | Jul 8, 2000 (24) | Central Arizona JC |
| Matt Olson ATL | 1B | 6' 5" / 225 lbs | Mar 29, 1994 (30) | None |
| Tyler Olson | RP | 6' 3" / 205 lbs | Oct 2, 1989 (35) | Gonzaga |
| Ryan Olson CIN | SP | 6' 2" / 195 lbs | Nov 22, 1994 (30) | Cal Poly Pomona |
| Reese Olson DET | SP | 6' 1" / 160 lbs | Jul 31, 1999 (25) | None |
| J.B. Olson | RP | 6' 2" / 195 lbs | Feb 15, 1995 (29) | Oklahoma |
| Emmett Olson MIA | SP | 6' 4" / 230 lbs | May 15, 2002 (22) | Nebraska |
| Bryant Olson WSH | P | 6' 4" / 190 lbs | Dec 19, 2002 (21) | Mercer |
| Braden Olthoff | SP | 6' 4" / 241 lbs | Mar 12, 1999 (25) | Tulane |
| Diego Omana CIN | C | 5' 11" / 165 lbs | Jan 10, 2003 (21) | None |
| Hunter Omlid COL | P | 6' 2" / 200 lbs | May 31, 2000 (24) | Arizona State |
| Gunn Omosako | P | 6' 4" / 190 lbs | May 12, 2001 (23) | None |
| Jorge Oña | RF | 6' 0" / 235 lbs | Dec 31, 1996 (27) | None |
| Ben Onyshko SEA | RP | 6' 2" / 205 lbs | Oct 18, 1996 (28) | Stetson |
| Casey Opitz CHC | C | 5' 11" / 200 lbs | Jul 30, 1998 (26) | Arkansas |
| Cam Opp | RP | 5' 10" / 185 lbs | Nov 4, 1995 (29) | West Point |
| Christian Oppor CHW | RP | 6' 2" / 175 lbs | Jul 23, 2004 (20) | Gulf Coast State JC (FL) |
| Alexander Orasma KC | SS | 6' 0" / 165 lbs | Nov 19, 2004 (20) | None |
| Eliezer Orbe SEA | P | 6' 0" / 165 lbs | Nov 7, 2005 (19) | None |
| Edgardo Ordonez MIL | C | 5' 11" / 155 lbs | Sep 24, 2003 (21) | None |
| Ernny Ordonez PIT | 3B | 6' 1" / 210 lbs | Jan 17, 1999 (25) | Central Arizona JC |
| Douglas Orellana NYM | RP | 6' 1" / 196 lbs | May 1, 2002 (22) | None |
| Austin Orewiler | SP | 6' 2" / 220 lbs | May 18, 1993 (31) | Rice |
| Nate Orf | 2B | 5' 8" / 181 lbs | Feb 1, 1990 (34) | Baylor |
| Brennan Orf TOR | OF | 6' 4" / 230 lbs | Sep 6, 2001 (23) | Southern Illinois |
| Demi Orimoloye | RF | 6' 4" / 225 lbs | Jan 6, 1997 (27) | None |
| Paulo Orlando | RF | 6' 2" / 210 lbs | Nov 1, 1985 (39) | - |
| Tirso Ornelas SD | LF | 6' 3" / 200 lbs | Mar 11, 2000 (24) | None |
| Jonathan Ornelas TEX | 3B | 6' 0" / 196 lbs | May 26, 2000 (24) | None |
| Brayan Oropeza MIL | C | 6' 1" / 175 lbs | Nov 18, 2003 (21) | None |
| Rodrigo Orozco | RF | 5' 11" / 155 lbs | Apr 2, 1995 (29) | None |
| Maikol Orozco DET | SS | 5' 11" / 175 lbs | Sep 9, 2005 (19) | None |
| Cody Orr | OF | 6' 2" / 212 lbs | Apr 2, 1999 (25) | Tiffin (OH) |
| J.D. Orr | CF | 5' 11" / 185 lbs | Sep 11, 1996 (28) | Wright State |
| Kaleb Ort HOU | RP | 6' 4" / 248 lbs | Feb 5, 1992 (32) | Aquinas (MI) |
| Rafael Ortega NYM | CF | 5' 11" / 200 lbs | May 15, 1991 (33) | None |
| Dennis Ortega | C | 6' 2" / 180 lbs | Jun 11, 1997 (27) | None |
| Jake Ortega NYM | C | 5' 10" / 175 lbs | Jul 31, 1996 (28) | Cal State Bakersfield |
| Oliver Ortega HOU | SP | 6' 0" / 185 lbs | Oct 2, 1996 (28) | None |
| Raynerd Ortega LAD | SS | 6' 1" / 154 lbs | Jul 8, 2005 (19) | None |
| Jorel Ortega MIN | SS | 6' 0" / 194 lbs | Jan 22, 2001 (23) | Tennessee |
| Juan Ortega BAL | C | 5' 8" / 177 lbs | Apr 10, 2006 (18) | None |
| Juan Ortega BAL | C | - / - | Apr 10, 2006 (18) | None |
| David Ortiz | DH | 6' 3" / 230 lbs | Nov 18, 1975 (49) | - |
| Luis F. Ortiz PHI | RP | 6' 3" / 230 lbs | Sep 22, 1995 (29) | None |
| Jhailyn Ortiz | RF | 6' 3" / 215 lbs | Nov 18, 1998 (26) | None |
| Joey Ortiz MIL | 3B | 5' 9" / 183 lbs | Jul 14, 1998 (26) | New Mexico State |
| Hayder Ortiz ATL | RP | 6' 0" / 160 lbs | Nov 14, 2001 (23) | None |
| German Ortiz OAK | SS | 6' 2" / 195 lbs | Aug 2, 2004 (20) | None |
| Robinson Ortiz LAD | SP | 6' 0" / 180 lbs | Jan 4, 2000 (24) | None |
| Abimelec Ortiz TEX | 1B | 6' 0" / 230 lbs | Feb 22, 2002 (22) | Florida Southwestern State JC |
| Channy Ortiz | SS | 5' 10" / 165 lbs | Apr 11, 1999 (25) | Grand Canyon |
| Angel Ortiz ARI | RF | 6' 0" / 180 lbs | Oct 3, 2002 (22) | None |
| Luis L. Ortiz PIT | SP | 6' 2" / 235 lbs | Jan 27, 1999 (25) | None |
| Jankel Ortiz MIN | SS | 5' 9" / 170 lbs | Jun 14, 2004 (20) | None |
| Diorky Ortiz BAL | SS | 5' 10" / 145 lbs | Nov 15, 2006 (18) | None |
| Didrky Ortiz BAL | IF | - / - | Nov 15, 2005 (19) | None |
| Walkin Ortiz TEX | P | 6' 6" / 200 lbs | Dec 7, 2001 (22) | None |
| Jose Ortiz SF | OF | 5' 11" / 165 lbs | Feb 13, 2005 (19) | None |
| Francisco Ortiz | C | 6' 0" / 160 lbs | Sep 15, 1999 (25) | None |
| Capri Ortiz LAA | SS | 6' 0" / 150 lbs | Apr 1, 2005 (19) | None |
| Nicolas Ortiz COL | C | 6' 0" / 173 lbs | Dec 31, 2006 (17) | None |
| Robin Ortiz CHC | OF | 6' 4" / 200 lbs | Sep 12, 2006 (18) | None |
| Deniel Ortiz STL | 3B | 6' 1" / 230 lbs | Aug 24, 2004 (20) | Walters State CC (TN) |
| D'Angelo Ortiz BOS | 3B | 6' 1" / 190 lbs | Jul 4, 2004 (20) | Miami Dade |
| David Ortiz Jr. TEX | 1B | 5' 11" / 225 lbs | - | None |
| Orlando Ortiz-Mayr LAD | RP | 6' 3" / 195 lbs | Dec 6, 1997 (26) | Troy |
| Juan Ortuno MIL | SS | 5' 8" / 165 lbs | Apr 26, 2007 (17) | None |
| Eric Orze TB | RP | 6' 4" / 195 lbs | Aug 21, 1997 (27) | New Orleans |
| Drake Osborn NYM | C | 5' 10" / 190 lbs | Jul 22, 1998 (26) | Louisiana-Lafayette |
| J.D. Osborne MIA | C | 6' 1" / 215 lbs | Jul 13, 1995 (29) | Tampa |
| Fran Oschell III LAA | P | 6' 7" / 230 lbs | Oct 18, 2002 (22) | Duke |
| Josh Osich | RP | 6' 3" / 232 lbs | Sep 3, 1988 (36) | Oregon State |
| Tyler Osik | C | 5' 10" / 203 lbs | Nov 15, 1996 (28) | Central Florida |
| Michael Osinski | 3B | 6' 2" / 195 lbs | Aug 4, 1995 (29) | Longwood |
| Graham Osman CIN | SP | 6' 3" / 185 lbs | Jan 29, 2001 (23) | Long Beach State |
| Bryce Osmond LAA | SP | 6' 3" / 188 lbs | Sep 5, 2000 (24) | Oklahoma State |
| Javier Osorio DET | SS | 6' 0" / 165 lbs | Mar 29, 2005 (19) | None |
| Luis Osorio BAL | SP | 6' 2" / 170 lbs | Jan 31, 2003 (21) | None |
| Oswaldo Osorio LAD | SS | 6' 1" / 171 lbs | Apr 15, 2005 (19) | None |
| Manuel Osorio CLE | RP | 5' 10" / 170 lbs | Mar 24, 2006 (18) | None |
| Isaac Osorio ATL | OF | 6' 1" / 180 lbs | Mar 12, 2007 (17) | None |
| Roque Osorio CHC | P | 6' 2" / 169 lbs | Oct 17, 2006 (18) | None |
| Erik Ostberg | C | 5' 10" / 225 lbs | Oct 12, 1995 (29) | Hartford |
| Roberto Osuna | RP | 6' 2" / 215 lbs | Feb 7, 1995 (29) | None |
| José Osuna | 3B | 6' 2" / 240 lbs | Dec 12, 1992 (31) | None |
| Alejandro Osuna TEX | RF | 6' 0" / 185 lbs | Oct 10, 2002 (22) | None |
| Corey Oswalt | RP | 6' 5" / 250 lbs | Sep 3, 1993 (31) | None |
| Taisei Ota | P | 5' 11" / 194 lbs | Jun 29, 1999 (25) | None |
| Michel Otañez OAK | RP | 6' 4" / 218 lbs | Jul 3, 1997 (27) | None |
| Peniel Otano ARI | SP | 6' 4" / 190 lbs | Oct 7, 2002 (22) | None |
| Dan Otero | RP | 6' 3" / 205 lbs | Feb 19, 1985 (39) | South Florida |
| Andy Otero | P | 5' 9" / 165 lbs | - | - |
| Travis Ott TB | P | 6' 4" / 175 lbs | Jun 25, 1999 (25) | None |
| Adam Ottavino | RP | 6' 5" / 246 lbs | Nov 22, 1985 (39) | Northeastern |
| Micah Ottenbreit PHI | SP | 6' 4" / 190 lbs | May 7, 2003 (21) | None |
| Glenn Otto HOU | SP | 6' 3" / 240 lbs | Mar 11, 1996 (28) | Rice |
| Daniel Ouderkirk | RP | 6' 9" / 256 lbs | Mar 16, 2000 (24) | West Virginia |
| Daniel Ouderkirk SEA | P | 6' 9" / 256 lbs | Mar 16, 2000 (24) | Pennsylvania State |
| William Ouellette | RP | 6' 1" / 195 lbs | Jun 30, 1993 (31) | None |
| James Outman LAD | CF | 6' 2" / 215 lbs | May 14, 1997 (27) | Sacramento State |
| Alexander Ovalles CIN | 1B | 6' 0" / 180 lbs | Oct 6, 2000 (24) | None |
| Anyelo Ovando SEA | RP | 6' 5" / 222 lbs | Dec 25, 2000 (23) | None |
| Austin Overn BAL | OF | 6' 0" / 175 lbs | May 10, 2003 (21) | Southern California |
| Dillon Overton | SP | 6' 2" / 175 lbs | Aug 17, 1991 (33) | Oklahoma |
| Connor Overton CIN | SP | 6' 0" / 205 lbs | Jul 24, 1993 (31) | Old Dominion |
| Johan Oviedo PIT | SP | 6' 5" / 245 lbs | Mar 2, 1998 (26) | None |
| Luis Oviedo | SP | 6' 5" / 250 lbs | May 15, 1999 (25) | None |
| Ivan Oviedo TEX | SP | 6' 2" / 175 lbs | Oct 14, 2002 (22) | None |
| Carlos Oviedo NYM | C | 6' 2" / 210 lbs | Aug 20, 2004 (20) | None |
| Hunter Owen | OF | 5' 11" / 197 lbs | Sep 22, 1993 (31) | Indiana State |
| Jack Owen OAK | RP | 6' 2" / 204 lbs | May 26, 1998 (26) | Auburn |
| Noah Owen CHW | SP | 6' 4" / 200 lbs | Oct 1, 2000 (24) | Golden West JC (CA) |
| Hunter Owen KC | RP | 6' 6" / 261 lbs | Jan 30, 2002 (22) | Vanderbilt |
| Tyler Owens DET | RP | 5' 10" / 185 lbs | Jan 9, 2001 (23) | None |
| Chris Owings LAD | 2B | 5' 10" / 185 lbs | Aug 12, 1991 (33) | None |
| Avery Owusu-Asiedu PHI | OF | 6' 4" / 230 lbs | Jun 16, 2003 (21) | Southern Illinois-Edwardsville |
| Daniel Ozoria MIN | SS | 5' 9" / 165 lbs | Aug 24, 2000 (24) | None |
| Marcell Ozuna ATL | DH | 6' 1" / 225 lbs | Nov 12, 1990 (34) | None |
| Fernery Ozuna | RP | 5' 8" / 170 lbs | Nov 9, 1995 (29) | None |
| Reniel Ozuna CIN | RF | 6' 2" / 202 lbs | Jul 29, 1998 (26) | None |
