- Maddux, Greg
- Mantei, Matt
- Mantle, Mickey
- Maris, Roger
- Martin, Billy
- Martinez, Pedro
- Martinez, Tino
- Mathews, Eddie
- Mathewson, Christy
- Matsui, Hideki
- Matsui, Kazuo
- Mattingly, Don
- Mays, Willie
- McCarver, Tim
- McCovey, Willie
- McDonald, John
- McGriff, Fred
- McGwire, Mark
- Meadows, Brian
- Michaels, Jason
- Molitor, Paul
- Mueller, Bill
- Mulder, Mark
- Mungo, Van Lingle
- Murphy, Dale
- Murray, Eddie
- Musial, Stan
- Mussina, Mike