- Raphael Saadiq – Charlie Ray Wiggins
- Sabah (Lebanese singer) – Jeanette Gergis Al-Feghali (or Jeanette Gergi Feghali)
- Sable – Rena Greek (also known as Rena Richardson, Rena Mero and Rena Lesnar in later years)
- Sabu (wrestler) – Terry Michael Brunk
- Sadayakko (a.k.a. Sada Yacco) – Sada Koyama
- Sade – Helen Folasade Adu
- Kenji Sahara (a.k.a. Sahara Kenji) – Masayoshi Kato
- Martine St. Clair – Martine Nault
- Lili St. Cyr – Willis Marie Van Schaack
- Ruth St. Denis – Ruth Denis
- James St. James – James Clark
- Rebecca St. James – Rebecca Smallbone
- Susan Saint James – Susan Jane Miller
- Betta St. John – Betty Jean Striegler
- Jill St. John – Jill Arlyn Oppenheim
- Buffy Sainte-Marie – Beverly Sainte-Marie
- Crispian St. Peters – Robin Peter Smith
- Pat Sajak – Patrick Leonard Sajdak
- S.Z. "Cuddles" Sakall – Gerõ Jenõ (later changed name to Szoke Szakáll)
- Chika Sakamoto – Chika Ishihara
- Soupy Sales – Milton Supman
- Fernando and Nefty Sallaberry – Fernando Ramón Sallaberry and Oscar Neftalí Saltcellar
- Ola Salo – Ola Svensson
- Salt-N-Pepa – Cheryl James & Sandra Denton
- Aldo Sambrell – Alfredo Sanchez Brell
- Samia – Samia Bracamonte
- Samoa Joe – Nuufolau Joel Seanoa
- Savanna Samson – Natalie Oliveros
- Lauren Samuels – Lauren Bonner
- Paul Sand – Paul Sanchez
- Julia Sanderson – Julia Sackett
- The Sandman – Jim Fullington
- Flo Sandon's – Mammola Sandon
- Kenneth Sandford – Kenneth Parkin
- Tiny Sandford – Stanley Sandford
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- Isabel Sanford – Eloise Gwendolyn Sanford
- Samantha Sang – Cheryl Gray
- Juelz Santana – LaRon Louis James
- Tito Santana – Merced Solis
- Santigold (formerly Santogold) – Santi White
- Father Guido Sarducci – Don Novello
- Dick Sargent – Richard Stanford Cox
- Georges Sarri – Georgia Sarivaxevani
- Tura Satana – Tura Luna Pascual Yamaguchi
- Saukrates (a.k.a. Big Sox) – Amani Wailoo
- Savage – Roberto Zanetti
- Ann Savage – Bernice Maxine Lyon
- Lily Savage – Paul James O'Grady
- Michael Savage – Michael Alan Weiner
- Randy Savage – Randall Mario Poffo
- Jan Savitt – Jacob Savetnick
- John Saxon – Carmine Orrico
- Leo Sayer – Gerard Hugh Sayer
- Jo Ann Sayers – Miriam Lucille Lilygren
- Rat Scabies – Chris Miller
- Boz Scaggs – William Royce Scaggs
- Delia Scala – Odette Bedogni
- Gia Scala – Giovanna Scoglio
- Prunella Scales – Prunella Margaret Rumney Illingworth
- Scarface – Brad Jordan
- Scatman John – John Paul Larkin
- Catherine Schell – Katherina Freiin Schell von Bauschlott
- Nicole Scherzinger – Nicole Prescovia Elikolani Valiente
- Lalo Schifrin – Boris Claudio Schifrin
- Maria Schneider – Marie Christine Gélin
- Romy Schneider – Rosemarie Magdalena Albach
- Teddy Scholten – Dorothea Margaretha van Swieteren
- Aaron Schroeder – Aaron Harold Schroder (or Aaron Harold Schröder)
- Scientist – Overton Brown
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- Izabella Scorupco – Izabela Dorota Skorupko
- Bon Scott – Ronald Belford Scott
- Gordon Scott – Gordon Merrill Werschkul
- Jack Scott – Jack Scafone
- Kathryn Leigh Scott – Marlene Kringstad
- Linda Scott – Linda Joy Sampson
- Lizabeth Scott – Emma Matzo
- Peggy Scott – Peggy Stoutmeyer
- Randolph Scott – George Randolph Crane
- Ronnie Scott – Ronald Schatt
- Angus Scrimm – Lawrence Rory Guy (also known as Lawrence Guy and Rory Guy)
- Johnny Sea – John Seay
- Seal – Sealhenry Olusegun Olumide Samuel (also Seal Henry Olusegun Olumide Adeola Samuel, varying sources)
- George Seaton – George Stenius
- Noot Seear – Renata Seear
- Julie Seitter – Julie Stinneford
- Seka – Dorothiea Hundley
- Connie Sellecca – Concetta Sellecchia
- Peter Sellers – Richard Henry Sellers
- Sen Dog – Sennen Reyes
- Mack Sennett – Mikall Sinnott (or Michael Sinnott, varying sources)
- MC Serch – Michael Berrin
- Yahoo Serious – Gregory Pead (changed name by deed poll to Yahoo Serious)
- Pilar Seurat – Rita Hernandez
- Johnny Seven – John Anthony Fetto, Jr. (or John Anthony Fetto, II)
- Steve Severin – Steven Bailey
- David Seville – Rostom Sipan Bagdasarian (also known as Ross Bagdasarian, Sr.)
- Anne Seymour – Anne Seymour Eckert
- Jane Seymour – Joyce Penelope Wilhelmina Frankenberg
- Sgt. Slaughter – Robert Remus
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