Oakes, Rebel
Oaks, Trevor
Oana, Prince
Oates, Johnny
Obando, Sherman
Ober, Bailey
Oberg, Scott
Oberholtzer, Brett
Oberkfell, Ken
Obermueller, Wes
O'Berry, Mike
Obradovich, Jim
O'Brien, Bob
O'Brien, Buck
O'Brien, Charlie
O'Brien, Dan
O'Brien, Dink
O'Brien, Eddie
O'Brien, George
O'Brien, Johnny
O'Brien, Pete
O'Brien, Peter
O'Brien, Ray
O'Brien, Riley
O'Brien, Syd
O'Brien, Tommy
Ochoa, Alex
Ochoa, Ivan
Ock, Whitey
Ockey, Walter
O'Connell, Danny
O'Connell, Jimmy
O'Connell, John
O'Connor, Brian
O'Connor, Jack
O'Connor, Mike
O'Connor, Paddy
O'Day, Darren
O'Dea, Ken
O'Dea, Paul
O'Dell, Billy
Odenwald, Ted
Odom, Blue Moon
Odom, Dave
Odom, Heinie
Odom, Joseph
O'Donnell, George
O'Donnell, Harry
O'Donoghue, John
O'Donoghue, John
Odor, Rougned
Odorizzi, Jake
O'Doul, Lefty
Oelkers, Bryan
Oeltjen, Trent
Oertel, Chuck
Oeschger, Joe
Oester, Ron
O'Farrell, Bob
Offerman, Jose
Office, Rowland
O'Flaherty, Eric
Ogando, Alexi
Ogando, Cristofer
Ogando, Nefi
Ogden, Curly
Ogden, Jack
Ogea, Chad
Oglesby, Jim
Oglivie, Ben
O'Grady, Brian
O'Grady, Chris
Ogrodowski, Bruce
Ogrodowski, Joe
Oh, Seung Hwan
O'Halloran, Greg
O'Hearn, Ryan
Ohka, Tomo
Ohlendorf, Ross
Ohlman, Mike
Ohman, Will
Ohme, Kevin
O'Hoppe, Logan
Ohtani, Shohei
Ojala, Kirt
Ojeda, Augie
Ojeda, Bob
Ojeda, Miguel
Okajima, Hideki
O'Keefe, Brian
Okert, Steven
Okey, Chris
Okrie, Frank
Okrie, Len
Olander, Jim
Oldham, Red
Oldis, Bob
Oldring, Rube
O'Leary, Charley
O'Leary, Troy
Olerud, John
Olin, Steve
Oliva, Jared
Oliva, Jose
Oliva, Tony
Olivares, Ed
Olivares, Edward
Olivares, Omar
Oliver, Al
Oliver, Andy
Oliver, Bob
Oliver, Darren
Oliver, Dave
Oliver, Gene
Oliver, Joe
Oliver, Nate
Oliver, Tom
Olivera, Hector
Oliveras, Francisco
Oliveros, Lester
Olivo, Chi-Chi
Olivo, Diomedes
Olivo, Miguel
Oller, Adam
Ollom, Jim
Olmedo, Ray
Olmo, Luis
Olmos, Edgar
Olmsted, Al
Olsen, Barney
Olsen, Kevin
Olsen, Ole
Olsen, Scott
Olsen, Vern
Olson, Garrett
Olson, Greg
Olson, Gregg
Olson, Ivy
Olson, Karl
Olson, Marv
Olson, Matt
Olson, Reese
Olson, Ted
Olson, Tim
Olson, Tyler
Olt, Mike
Olwine, Ed
O'Malley, Ryan
O'Malley, Shawn
O'Malley, Tom
O'Mara, Ollie
Omogrosso, Brian
Ona, Jorge
Ondrusek, Logan
O'Neal, Randy
O'Neal, Skinny
O'Neil, John
O'Neil, Mickey
O'Neill, Emmett
O'Neill, Harry
O'Neill, Jim
O'Neill, Paul
O'Neill, Steve
O'Neill, Tyler
Onis, Curly
Onslow, Eddie
Onslow, Jack
Ontiveros, Steve
Ontiveros, Steve
Oquendo, Jose
Oquist, Mike
Oravetz, Ernie
Ordaz, Luis
Ordenana, Tony
Ordonez, Magglio
Ordonez, Rey
Orengo, Joe
Orf, Nate
Orie, Kevin
O'Riley, Don
Orlando, Paulo
Orme, George
Ornelas, Jonathan
Oropesa, Eddie
Orosco, Jesse
O'Rourke, Frank
O'Rourke, Jim
O'Rourke, Joe
O'Rourke, Ryan
Orr, Billy
Orr, Pete
Orrell, Joe
Orsatti, Ernie
Orsino, John
Orsulak, Joe
Ort, Kaleb
Orta, Jorge
Ortega, Anthony
Ortega, Bill
Ortega, Jose
Ortega, Oliver
Ortega, Phil
Ortega, Rafael
Ortenzio, Frank
Ortiz, Baby
Ortiz, Danny
Ortiz, David
Ortiz, Hector
Ortiz, Javier
Ortiz, Joe
Ortiz, Joey
Ortiz, Jose
Ortiz, Jose
Ortiz, Junior
Ortiz, Luis
Ortiz, Luis
Ortiz, Luis
Ortiz, Ramon
Ortiz, Roberto
Ortiz, Russ
Ortmeier, Daniel
Orton, John
Orvella, Chad
Orwoll, Ossie
Osborn, Bob
Osborn, Ozzie
Osborne, Bobo
Osborne, Donovan
Osborne, Tiny
Osborne, Wayne
Osburn, Pat
Osgood, Charlie
Osich, Josh
Osik, Keith
Osinski, Dan
Osoria, Franquelis
Osteen, Claude
Osteen, Darrell
Oster, Bill
Ostergard, Red
Ostermueller, Fritz
Osting, Jimmy
Ostrosser, Brian
Ostrowski, Joe
Ostrowski, Johnny
O'Sullivan, Sean
Osuna, Al
Osuna, Antonio
Osuna, Jose
Osuna, Roberto
Oswalt, Corey
Oswalt, Roy
Otanez, Willis
Otero, Dan
Otero, Reggie
Otero, Ricky
Otis, Amos
Otis, Bill
O'Toole, Denny
O'Toole, Jim
O'Toole, Marty
Otsuka, Akinori
Ott, Billy
Ott, Ed
Ott, Mel
Ottavino, Adam
Otten, Jim
Otto, Dave
Otto, Glenn
Ouellette, Phil
Oulliber, Johnny
Outen, Chink
Outlaw, Jimmy
Outman, James
Outman, Josh
Overall, Orval
Overbay, Lyle
Overmire, Stubby
Overton, Connor
Overton, Dillon
Overy, Mike
Oviedo, Johan
Oviedo, Luis
Owchinko, Bob
Owen, Dave
Owen, Hunter
Owen, Larry
Owen, Marv
Owen, Mickey
Owen, Spike
Owens, Eric
Owens, Henry
Owens, Henry
Owens, Jack
Owens, Jayhawk
Owens, Jerry
Owens, Jim
Owens, Rudy
Owings, Chris
Owings, Micah
Ownbey, Rick
Oxspring, Chris
Oyler, Ray
Ozmer, Doc
Ozuna, Marcell
Ozuna, Pablo