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- Alex Pacheco
- Jorge Padilla
- David Palmer
- José Paniagua
- Stan Papi
- Johnny Paredes
- Jeff Parrett
- Larry Parrish
- Val Pascucci
- Bob Pate
- Corey Patterson
- John Patterson
- Carl Pavano
- Brad Peacock
- Wily Mo Peña
- Joel Peralta
- Beltrán Pérez
- Carlos Pérez
- Eury Pérez
- Odalis Pérez
- Pascual Pérez
- Robert Pérez
- Tony Pérez
- Ryan Perry
- Chris Peters
- Marty Pevey
- Ken Phelps
- Adolfo Phillips
- Mike Phillips
- Doug Piatt
- Luis Pineda
- Gerry Pirtle
- Jim Poole
- Alonzo Powell
- Jeremy Powell
- Curtis Pride
Read more about this topic: Washington Nationals All-time Roster