In the history of the Boston Red Sox, there have been over 1,700 different players to wear a Boston uniform. Listed here in alphabetical order are all players whose last names begin with any letter between M and R.
M
- Mike Macfarlane
- Danny MacFayden
- Alejandro Machado
- Jean Machi
- Shane Mack
- Billy MacLeod
- Keith MacWhorter
- Bunny Madden
- Austin Maddox
- Mike Maddux
- Pete Magrini
- Ron Mahay
- Pat Mahomes
- Chris Mahoney
- Jim Mahoney
- Mark Malaska
- Jose Malave
- Jerry Mallett
- Paul Maloy
- Frank Malzone
- Matt Mantei
- Felix Mantilla
- Jeff Manto
- Robert Manuel
- Heinie Manush
- Josias Manzanillo
- Phil Marchildon
- Johnny Marcum
- Juan Marichal
- Ollie Marquardt
- Deven Marrero
- Bill Marshall
- Mike Marshall
- Babe Martin
- Kyle Martin
- Anastacio Martinez
- J.D. Martinez
- Michael Martinez
- Pedro Martinez
- Ramon Martinez
- Sandy Martinez
- Victor Martinez
- John Marzano
- Justin Masterson
- Walt Masterson
- Tommy Matchick
- Daisuke Matsuzaka
- William Matthews
- Gene Mauch
- Charlie Maxwell
- Wally Mayer
- Chick Maynard
- Carl Mays
- Dick McAuliffe
- Tom McBride
- Dick McCabe
- Windy McCall
- Emmett McCann
- Tom McCarthy
- Dave McCarty
- Tim McCarver
- Amby McConnell
- Mickey McDermott
- Allen McDill
- Darnell McDonald
- Jim McDonald
- John McDonald
- Ed McFarland
- Eddie McGah
- Willie McGee
- Lynn McGlothen
- Art McGovern
- Bob McGraw
- Deacon McGuire
- Jim McHale
- Marty McHale
- Stuffy McInnis
- Archie McKain
- Walt McKeel
- Jud McLaughlin
- Larry McLean
- Doc McMahon
- Don McMahon
- Marty McManus
- Norm McMillan
- Eric McNair
- Mike McNally
- Gordon McNaughton
- Jeff McNeely
- Norm McNeil
- Bill McWilliams
- Roman Mejias
- Mark Melancon
- Sam Mele
- Jose Melendez
- Ski Melillo
- Bob Melvin
- Roman Mendez
- Ramiro Mendoza
- Mike Menosky
- Mike Meola
- Orlando Merced
- Andy Merchant
- Kent Mercker
- Cla Meredith
- Spike Merena
- Lou Merloni
- Jack Merson
- George Metkovich
- Russ Meyer
- John Michaels
- Will Middlebrooks
- Dick Midkiff
- Doug Mientkiewicz
- Dee Miles
- Wade Miley
- Kevin Millar
- Andrew Miller
- Bing Miller
- Corky Miller
- Elmer Miller
- Hack Miller
- Mike Miller
- Otis Miller
- Rick Miller
- Trever Miller
- Wade Miller
- Buster Mills
- Dick Mills
- Rudy Minarcin
- Nate Minchey
- Doug Mirabelli
- Charlie Mitchell
- Fred Mitchell
- Johnny Mitchell
- Keith Mitchell
- Kevin Mitchell
- Herb Moford
- Dustan Mohr
- Gustavo Molina
- Vince Molyneaux
- Bill Monbouquette
- Yoan Moncada
- Freddie Moncewicz
- Bob Montgomery
- Bill Moore
- Wilcy Moore
- Franklin Morales
- Dave Morehead
- Mitch Moreland
- Roger Moret
- Cy Morgan
- Ed Morgan
- Red Morgan
- Ed Morris
- Frank Morrissey
- Clayton Mortensen
- Kevin Morton
- Moose Morton
- Earl Moseley
- Walter Moser
- Jerry Moses
- Wally Moses
- Doc Moskiman
- Brandon Moss
- Les Moss
- Jamie Moyer
- Bill Mueller
- Gordie Mueller
- Billy Muffett
- Edward Mujica
- Greg Mulleavy
- Freddie Muller
- Joe Mulligan
- Frank Mulroney
- Bill Mundy
- David Murphy
- Johnny Murphy
- Rob Murphy
- Tom Murphy
- Walter Murphy
- George Murray
- Matt Murray
- Tony Muser
- Paul Musser
- Alex Mustaikis
- Buddy Myer
- Elmer Myers
- Hap Myers
- Mike Myers
N
- Chris Nabholz
- Tim Naehring
- Judge Nagle
- Mike Nagy
- Mike Napoli
- Bill Narleski
- Daniel Nava
- Yamaico Navarro
- Blaine Neal
- Ernie Neitzke
- Bry Nelson
- Joe Nelson
- Hal Neubauer
- Don Newhauser
- Jeff Newman
- Bobo Newsom
- Dick Newsome
- Skeeter Newsome
- Gus Niarhos
- Chet Nichols
- Reid Nichols
- Al Niemiec
- Harry Niles
- Al Nipper
- Merlin Nippert
- Otis Nixon
- Russ Nixon
- Trot Nixon
- Willard Nixon
- Hideo Nomo
- Red Nonnenkamp
- Chet Nourse
- Les Nunamaker
- Eduardo Nunez
- Jon Nunnally
O
- Mike O'Berry
- Buck O'Brien
- Jack O'Brien
- Syd O'Brien
- Tommy O'Brien
- Lefty O'Doul
- Troy O'Leary
- Bill O'Neill
- Emmett O'Neill
- Steve O'Neill
- Frank O'Rourke
- Sean O'Sullivan
- Frank Oberlin
- Jose Offerman
- Alexi Ogando
- Ben Oglivie
- Tomo Ohka
- Bob Ojeda
- Hideki Okajima
- Len Okrie
- John Olerud
- Darren Oliver
- Gene Oliver
- Joe Oliver
- Tom Oliver
- Hank Olmsted
- Karl Olson
- Marv Olson
- Ted Olson
- Steve Ontiveros
- George Orme
- David Ortiz
- Luis Ortiz
- Dan Osinski
- Harry Ostdiek
- Fritz Ostermueller
- Johnny Ostrowski
- Marv Owen
- Mickey Owen
- Spike Owen
- Henry Owens
- Yip Owens
- Chris Owings
P
- Vicente Padilla
- Jim Pagliaroni
- Mike Palm
- Jim Pankovits
- Al Papai
- Larry Pape
- Jonathan Papelbon
- Stan Papi
- Freddy Parent
- Mel Parnell
- Larry Parrish
- Roy Partee
- Stan Partenheimer
- Ben Paschal
- Casey Patten
- Eric Patterson
- Hank Patterson
- Marty Pattin
- David Pauley
- Don Pavletich
- Mike Paxton
- Jay Payton
- Johnny Peacock
- Steve Pearce
- Jake Peavy
- Dustin Pedroia
- Carlos Peguero
- Eddie Pellagrini
- Rudy Pemberton
- Alejandro Pena
- Carlos Pena
- Jesus Pena
- Juan Pena
- Tony Pena
- Wily Mo Pena
- Brad Pennington
- Herb Pennock
- Brad Penny
- Tony Perez
- Matt Perisho
- John Perrin
- Robert Person
- Bill Pertica
- Johnny Pesky
- Roberto Petagine
- Gary Peters
- Bob Peterson
- Rico Petrocelli
- Dan Petry
- Dave Philley
- Brandon Phillips
- Ed Phillips
- Hipolito Pichardo
- Val Picinich
- Calvin Pickering
- Urbane Pickering
- Jeff Pierce
- Bill Piercy
- Jim Piersall
- A.J. Pierzynski
- Joel Pineiro
- George Pipgras
- Greg Pirkl
- Pinky Pittenger
- Juan Pizarro
- Phil Plantier
- Herb Plews
- Jeff Plympton
- Scott Podsednik
- Jennings Poindexter
- Dick Pole
- Nick Polly
- Drew Pomeranz
- Ralph Pond
- Tom Poquette
- Rick Porcello
- Dick Porter
- Bob Porterfield
- Mark Portugal
- Nels Potter
- Ken Poulsen
- Bobby Poyner
- Arquimedez Pozo
- Del Pratt
- Larry Pratt
- George Prentiss
- David Price
- Joe Price
- Curtis Pride
- Doc Prothro
- Tex Pruiett
- Bill Pulsipher
- Nick Punto
- Billy Purtell
- Frankie Pytlak
Q
R
- Dick Radatz
- Dave Rader
- Chuck Rainey
- Erasmo Ramirez
- Hanley Ramirez
- Manny Ramirez
- Noe Ramirez
- Ramon Ramirez
- Anthony Ranaudo
- Pat Rapp
- Jeff Reardon
- Josh Reddick
- Johnny Reder
- Addison Reed
- Jerry Reed
- Jody Reed
- Pokey Reese
- Bobby Reeves
- Bill Regan
- Wally Rehg
- Dick Reichle
- Mike Remlinger
- Win Remmerswaal
- Jerry Remy
- Tony Renda
- Steve Renko
- Bill Renna
- Edgar Renteria
- Jason Repko
- Rip Repulski
- Carlos Reyes
- Dennys Reyes
- Carl Reynolds
- Gordon Rhodes
- Tuffy Rhodes
- Hal Rhyne
- Jim Rice
- Woody Rich
- Dustin Richardson
- Jeff Richardson
- Al Richter
- Joe Riggert
- Topper Rigney
- Ernie Riles
- Allen Ripley
- Walt Ripley
- Pop Rising
- David Riske
- Jay Ritchie
- Luis Rivera
- Carlos Rivero
- Dave Roberts
- Ryan Roberts
- Billy Jo Robidoux
- Aaron Robinson
- Floyd Robinson
- Jack Robinson
- Mike Rochford
- Bill Rodgers
- Carlos Rodriguez
- Eduardo Rodriguez
- Frankie Rodriguez
- Steve Rodriguez
- Tony Rodriguez
- Billy Rogell
- Lee Rogers
- Garry Roggenburk
- Billy Rohr
- Red Rollings
- Ed Romero
- J.C. Romero
- Mandy Romero
- Niuman Romero
- Kevin Romine
- Vicente Romo
- Buddy Rosar
- Brian Rose
- Sy Rosenthal
- Buster Ross
- Cody Ross
- David Ross
- Robbie Ross
- Braggo Roth
- Jack Rothrock
- Rich Rowland
- Stan Royer
- Joe Rudi
- Muddy Ruel
- Red Ruffing
- Pete Runnels
- Ryan Rupe
- Allen Russell
- Jack Russell
- Jeff Russell
- Rip Russell
- Babe Ruth
- Josh Rutledge
- Jack Ryan
- Jack Ryan
- Ken Ryan
- Mike Ryan
- Mike Ryba
- Gene Rye