- John Pfannenstein
- John Phillips
- John Phillips
- John Philp
- John Piasta
- John Pierucci
- John Pietrzak
- John Pilbeam
- John Pircon
- John Piret
- John Pirrie
- John Plenderleath
- John Pless
- John Plewa
- John Poirier
- John Poling
- John Polis
- John Pollington
- John Pollock
- John Pomerance
- John Pontius
- John Poole
- John Popehn
- John Poppe
- John Poppe
- John Porter
- John Pouschine
- John Powell
- John Powell
- John Power
- John Presley
- John Pringle
- John Pritzker
- John Pruitt
- John Prunier
- John Prutch
- John Pual Preston
- John Quinn
- John Quintanar
- John Quirk