- Maleeva, Magdalena
- Manning, Eli
- Manning, Peyton
- Mantle, Mickey
- Marbury, Stephon
- Margera, Bam
- Marino, Dan
- Marion, Shawn
- Maris, Roger
- Marlin, Sterling
- Martin, Curtis
- Martin, Kenyon
- Martinez, Pedro
- Massaro, Ashley
- Matsui, Hideki
- Mattingly, Don
- Mauresmo, Amelie
- May, Misty
- Mayfield, Jeremy
- Mays, Willie
- McCool, Michelle
- McEnroe, John
- McGrady, Tracy
| - McNabb, Donovan
- Mears, Casey
- Mesa, Jose
- Michelle, Candice
- Mickelson, Phil
- Miller, Reggie
- Miller, Shannon
- Ming, Yao
- Mirra, Dave
- Montana, Joe
- Moore, Donnie
- Mora, Melvin
- Mordecai, Mike
- Moreau, Ethan
- Morigami, Akiko
- Moss, Randy
- Mourning, Alonzo
- Moya, Carlos
- Mulder, Mark
- Munson, Thurman
- Mussina, Mike
- Mysterio, Rey
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