- William Patterson
- William Patterson
- William Paul
- William Payeaux
- William Payer
- William Payeux
- William Payn
- William Pears
- William Pears
- William Peaychew
- William Peeples
- William Penix
- William Penn
- William Penn
- William Penn
- William Penn & His Pals
- William Penn V
- William Perritt
- William Perry
- William Petter
- William Picher
- William Pint
- William Pitt
- William Pleeth
- William Poogie Hart
- William "Poor Bill" White
- William Porter
- William Porter William Porter
- William Portillo
- William Portis
- William Powell
- William Powell
- William Powers
- William Presland
- William Preucil
- William Preucil
- William Price
- William Price Garrott
- William Primrose
- William Purvis
- William Purvis
- William Purvis
- William Quartette Blevin
- William R. Dunkoff
- William R. Strickland
- William Rainer, Jr.
- William Ramos
- William Ramsay
- William Randolph
- William Ratel
- William Ray
- William Rayner
- William Red Rossi
- William "Redd" M., Sr. Crook
- William Reddie
- William Redfield
- William Reedy
- William Regal
- William Reilly
- William Renan
- William Rew
- William Reynolds
- William Rhinehart
- William Rieflin
- William Rimson & Let Praise...
- William Rivera
- William Roache
- William Roberts
- William Robertson
- WILLIAM ROBINSON
- William Robison & His Orchestra
- William Roper
- William Rosario