- P-Star – Priscilla Star Diaz
- Master P – Percy Miller Sr.
- Augustus Pablo – Horace Swaby
- Petey Pablo – Moses Barrett
- Padmanabham (actor) – Basavaraju Venkata Padmanabha Rao
- Angelica Page – Angelica Torn
- Anita Page – Anita Evelyn Pomares
- Diamond Dallas Page – Page Joseph Falkinburg, Jr.
- Gale Page – Sally Perkins Rutter
- Geneviève Page – Geneviève Bronjean
- Hot Lips Page (a.k.a. Lips Page) – Oran Alfred Page
- Joy Page – Joy Cerrette Paige
- Patti Page – Clara Ann Fowler
- Teddy Page (akas: Ted Johnson, Irvin Johnson) – Teddy Chiu
- Debra Paget – Debralee Griffin
- Elaine Paige – Elaine Mary Bickerstaff
- Janis Paige – Donna Mae Tjaden
- Robert Paige – John Arthur Page
- George Pal – György Pál Marczincsák
- Jack Palance – Volodymyr Palahniuk (also known as Jack Brazzo when he was a boxer)
- Ron Palillo – Ronald Gabriel Paolillo
- Palito – Reynaldo Alfredo Hipolito
- Andrea Palma – Guadalupe Bracho Pérez-Gavilán
- Joe Palma – Joseph Provenzano
- Betsy Palmer – Patricia Betsy Hrunek
- Jeff Palmer – David Zuloaga
- Lilli Palmer – Lillie Marie Peiser
- Patsy Palmer – Julie Anne Harris
- Chazz Palminteri – Calogero Lorenzo Palminteri
- Alexander Pantages – Pericles Pantages
- Irene Papas – Irene Lelekou
- Paperboy – Mitchell Johnson
- Paris – Oscar Jackson, Jr.
- Henry Paris – Radley Metzger
- Jerry Paris – William Gerald Grossman (later known as William Gerald Paris)
- Mica Paris – Michelle Wallen
- Victoria Paris – Sheila Young
- Annie Parisse – Anne Marie Cancelmi
- Cecil Parker – Cecil Schwabe
- Jean Parker – Lois Mae Green
- Kay Parker – Kay Rebecca Taylor
- Sunshine Parker – Lloyd Olen Parker
- Colonel Tom Parker – Andreas Cornelius van Kuijk
- Allison Parks – Gloria Waldron
- Bert Parks – Bertram Jacobson
- Larry Parks – Samuel Klausman Lawrence Parks (or Samuel Lawrence Klausman Parks, varying sources)
- Parkyakarkus (a.k.a. Harry Parke) – Harold Einstein
- Gigi Parrish – Katherine Gertrude McElroy
- Buck Parvin (a.k.a. Art Acord) – Arthemus Ward Acord
- Elli Parvo – Elvira Gobbo
- Sylvia Pasquel – Sylvia Banquells Pinal
- Michael Pate – Edward John Pate
- Butch Patrick – Patrick Alan Caples
- Tera Patrick – Linda Ann Hopkins Shapiro
- Hank Patterson – Elmer Calvin Patterson
- Pat Patterson (wrestler) – Pierre Clemont
- Billy Paul – Paul Williams
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- Les Paul – Lester William Polfuss
- Vinnie Paul – Vincent Paul Abbott
- Marisa Pavan – Maria Luisa Pierangeli
- Katina Paxinou – Ekaterini Konstantopoulou
- Johnny Paycheck – Donald Eugene Lytle
- Barbara Payton – Barbara Lee Redfield
- Tawny Peaks – Michele Ann Laird
- Jack Pearl – Jack Perlman
- Minnie Pearl – Sarah Ophelia Colley
- Harold Peary – José Pereira de Faria
- Pebbles – Perri Alette McKissack
- John Peel – John Robert Parker Ravenscroft
- Simon Pegg – Simon John Beckingham
- Queen Pen – Lynise Walters
- Dan Penn – Wallace Daniel Pennington
- Dawn Penn – Dawn Pickering
- Kal Penn – Kalpen Suresh Modi
- Larry "Bud" Pennell – Alessandro Pennelli
- Joe Penner – József Pintér
- Barbara Pepper – Marion Pepper
- Mr. Perfect – Curtis Michael Hennig
- Pinetop Perkins – Joseph William Perkins
- Gigi Perreau – Ghislaine Elizabeth Marie Thérèse Perreau-Saussine
- Lynne Perrie – Jean Dudley
- Jim Perry – James Edward Dooley
- Joe Perry – Anthony Joseph Pereira
- Lee "Scratch" Perry – Rainford Hugh Perry
- Katy Perry – Katheryn Elizabeth Hudson
- Bernadette Peters – Bernadette Lazzara
- Roberta Peters – Roberta Peterman
- Susan Peters – Suzanne Carnahan
- Gilles Peterson – Gilles Jerome Moehrle
- Lenka Peterson – Betty Ann Isacson
- Le Pétomane – Joseph Pujol
- Olga Petrova – Muriel Harding
- Joanna Pettet – Joanna Jane Salmon
- Slim Jim Phantom – James McDonnell
- Phife Dog – Malik Taylor
- Esther Phillips – Esther Mae Jones
- Lou Diamond Phillips – Louis Upchurch
- Siân Phillips – Jane Elizabeth Ailwên Phillips
- Sally Phipps – Nellie Bernice Bogdon
- Beth Phoenix – Elizabeth Kocanski
- Pat Phoenix – Patricia Frederica Mansfield (later known as Patricia Pilkington)
- Édith Piaf – Édith Gassion
- Piano Red – William Perryman
- Marguerite Piazza – Marguerite Claire Luft
- Slim Pickens – Louis Bert Lindley, Jr.
- Jack Pickford – John Charles Smith
- Mary Pickford – Gladys Mary Smith
- Molly Picon – Małka Opiekun
- Aida Pierce – Aida Maria Zerecero
- David Hyde Pierce – David Pierce
- Pigge – Hette Gubbels
- Jacques Pills – René Jacques Ducos
- Pimp C – Chad Butler
- Bonnie Pink – Kaori Asada
- Pink – Alecia Beth Moore
- Billie Piper – Lianne Paul Piper
- Roddy Piper – Roderick George Toombs
- Camila Pitanga – Camila Manhães Sampaio
- Ingrid Pitt – Ingoushka Petrov
- Pitbull – Armando Christian Pérez
- Bucky Pizzarelli – John Paul Pizzarelli
- Eddie Platt – Edward Platakis
- Alice Playten – Alice Plotkin
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- Julian Plenti – Paul Banks
- Fernando Poe, Jr. – Ronald Allan Kelley Poe
- Buster Poindexter – David Roger Johansen
- Gene Pollar – Joseph Charles Pohler
- Daphne Pollard – Daphne Trott
- Michael J. Pollard – Michael John Pollack, Jr.
- Snub Pollard – Harold Fraser
- Poly Styrene – Marianne Joan Elliott-Said
- Doc Pomus – Jerome Solon Felder
- Lily Pons – Alice Joséphine Pons
- Rosa Ponselle – Rosa Ponzillo
- Jim Ed Poole – Tom Keith
- Iggy Pop – James Newell Osterberg, Jr.
- Porky (Our Gang) – Eugene Gordon Lee
- Henny Porten – Frieda Ulricke Porten
- Montel Vontavious Porter – Alvin Burke, Jr. (changed to Hassan Hamin Assad upon conversion to Islam)
- Nyree Dawn Porter – Ngaire Porter
- Natalie Portman – Natalie Hershlag
- Positive K – Darryl Gibson
- Mike Post – Leland Michael Postil
- Nell Potts – Elinor Teresa Newman
- Bud Powell – Earl Rudolph Powell
- Cozy Powell – Colin Flooks
- Jane Powell – Suzanne Lorraine Burce
- Bridget Powers – Cheryl Marie Murphy
- Kid Congo Powers – Brian Tristan
- Mala Powers – Mary Ellen Powers
- Stefanie Powers (a.k.a. Taffy Paul) – Stefanie Zofya Paul
- Pras – Prakazrel Samuel Michel
- Evelyn Preer – Evelyn Jarvis
- Ann Prentiss – Ann Ragusa
- Paula Prentiss – Paula Ragusa
- Olga Preobrajenska – Olga Iosifovna Preobrazhenskaya
- Micheline Presle – Micheline Nicole Julia Émilienne Chassagne
- Hovis Presley – Richard Henry McFarlane
- Reg Presley – Reginald Maurice Ball
- Johnny Preston – John Preston Courville
- Robert Preston – Robert Preston Meservey
- Chilton Price – Chilton Searcy
- Dennis Price – Dennistoun Franklyn John Rose-Price
- Toni Price – Luiese Esther Price
- Maxi Priest – Max Elliot
- Prince Adam – Adam Deibert
- Prince Buster – Cecil Bustamente Campbell
- Prince Paul – Paul Houston
- Princess Superstar – Concetta Kirschner
- Aileen Pringle – Aileen Bisbee
- Percy Pringle – William Alvin Moody
- Yvonne Printemps – Yvonne Wignolle
- Freddie Prinze – Frederick Karl Pruetzel
- P.J. Proby – James Marcus Smith
- El-Producto – Jaime Meline
- Promoe – Nils Mårten Ed
- Proof – DeShaun Holt
- Robert Prosky – Robert Joseph Porzuczek
- Jeanne Pruett – Norma Jean Bowman
- Jonathan Pryce – John Price
- Red Prysock – Wilburt Prysock
- Puma Swede – Johanna Jussinniemi
- CM Punk – Phillip Jack Brooks
- Missi Pyle – Andrea Kay Pyle
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