- Rambo Amadeus – Antonije Pušić
- Lucine Amara – Lucine Armaganian
- The Amazing Jonathon – John Edward Szeles
- Lauren Ambrose – Lauren Anne D'Ambruoso
- Don Ameche – Dominic Felix Amici
- Leon Ames – Leon Wycoff
- Ana-Alicia – Ana Alicia Ortíz
- June Allyson – Eleanor Geisman
- Tori Amos – Myra Ellen Amos
- Irena Anders (a.k.a. Renata Bogdańska) – Iryna Jarosiewicz
- Luana Anders – Luana Margo Anderson
- Merry Anders – Mary Helen Anderson
- Thomas Anders – Bernd Weidung
- Arn Anderson – Martin Anthony Lunde
- Broncho Billy Anderson – Max Aronson
- Eddie "Rochester" Anderson – Edmund Lincoln Anderson
- Dame Judith Anderson – Frances Margaret Anderson-Anderson (or Frances Margaret Anderson, varying sources)
- Juliet Anderson – Judith Carr
- Ole Anderson – Alan Robert Rogowski
- Keith Andes – John Charles Andes
- Fern Andra – Vernal Edna Andrews
- Lona Andre – Launa Anderson
- André 3000 – André Benjamin
- André the Giant – André René Roussimoff
- Andrew W.K. – Andrew Fetterly Wilkes Krier
- Tony Andruzzi (akas: Tony Andruzzi, Masklyn ye Mage, and Daemon Ecks) – Antonio C. Andruzzi (name legally changed to Thomas S. Palmer)
- Bob Andy – Keith Anderson
- Horace Andy – Horace Hinds
- Anémone – Anne Bourguignon
- Angel & Khriz – Angel Rivera Guzmán and Christian Colón
- Criss Angel – Criss Sarantakos
- Pier Angeli – Anna Maria Pierangeli
- John Aniston – Yannis Anastassakis
- Morris Ankrum – Morris Nussbaum
- Julia Ann – Julia Ann Tavella
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- ANT – Anthony Steven Kalloniatis
- Adam Ant – Stuart Leslie Goddard
- Ant & Dec – Anthony David McPartlin and Declan Joseph Oliver Donnelly
- Gerald Anthony – Gerald Anthony Bucchiarelli
- Little Anthony – Jerome Anthony Gourdine
- Lysette Anthony – Lysette Chodzko
- Marc Anthony – Marco Antonio Muñiz
- Michael Anthony – Michael Anthony Sobolewski
- Ray Anthony – Raymond Antonioni
- Steve Anthony – Steve Gomes
- Chico Anysio – Francisco Anysio de Oliveira Paula Filho
- Apache (rapper) – Anthony Peaks
- Apache Indian – Steven Kapur
- Aphex Twin – Richard David James
- apl.de.ap (The Black Eyed Peas) – Allan Pineda Lindo
- Apollonia – Patricia Kotero
- Navodaya Appachan – Maliampurackal Chacko Punnoose
- Fiona Apple – Fiona Apple McAfee Maggart
- Jeremy Applegate – Paul Andrew Boyce
- Beni Arashiro – Arashiro Beni
- Fatty Arbuckle – Roscoe Conkling Arbuckle
- Gem Archer – Colin Murray Archer
- Eve Arden – Eunice Quedens
- Don Arden – Harry Levy
- Jann Arden – Jann Arden Richards
- Toni Arden – Antoinette Ardizzone
- Tina Arena – Filippina Lydia Arena
- Imperio Argentina – Magdalena Nile del Río
- Victor Argo – Victor Jimenez
- Harold Arlen – Chaim Arlook or Hyman Arluck (varying sources)
- Richard Arlen – Cornelius Richard Van Mattimore
- George Arliss – George Augustus Andrews
- Jay J. Armes – Julian Armas
- James Arness – James Aurness
- Sig Arno – Siegfried Aron
- Danny Arnold – Arnold Rothmann
- Edward Arnold – Gunther Edward Arnold Schneider
- Kokomo Arnold (a.k.a. Gitfiddle Jim) – James Arnold
- Antonin Artaud – Antoine Marie Joseph Artaud
- Jean Arthur – Gladys Georgianna Greene
- Julia Arthur – Ida Lewis
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- Renee Asherson (aka: Renée Asherson) – Dorothy Renée Ascherson
- Annaleigh Ashford – Annaleigh Swanson
- Brooke Ashley – Anne Marie Ballowe
- Edward Ashley – Edward Montague Hussey Cooper (or Edward Montagu Ashley Cooper, varying sources)
- Beata Asimakopoulou – Evdokia Asimakopoulou
- Lys Assia – Rosa Mina Schärer
- Adele Astaire – Adele Marie Austerlitz
- Fred Astaire – Frederick Austerlitz
- Mary Astor – Lucile Vasconcellos Langhanke
- Astro – Terence Wilson
- Rich Asuncion – Richell Pacaldo Angalot
- Cholly Atkins – Charles Sylvan Atkinson
- Barry Atwater – Garrett Atwater
- Jeanne Aubert – Marguerite Perrinot
- Isabelle Aubret – Thérèse Coquerelle
- James Aubrey – James Aubrey Tregidgo
- Cécile Aubry – Anne-José Madeleine Henriette Bénard
- Eleanor Audley – Eleanor Zellman
- Pascale Audret – Pascale Aiguionne Louise Jacqueline Marie Auffray
- Mischa Auer – Mikhail Semyonovich Unskovsky (some sources indicate Ounskowsky)
- Hugues Aufray – Hugues Jean Marie Auffray
- Pernilla August – Mia Pernilla Hertzman-Ericson
- Jean-Pierre Aumont – Jean-Pierre Philippe Salomons
- Aunt Jemima – Therese Gardella
- Gene Austin – Lemeul Eugene Lucas
- Jake T. Austin – Jake Austin Szymanski
- Lovie Austin – Cora Calhoun
- Stone Cold Steve Austin – Steven James Anderson, later Steven James Williams (legally changed to Steve Austin)
- Amy Austria – Esmeralda Dizon Tuazon
- Frankie Avalon – Francis Thomas Avallone
- Chucho Avellanet – Armando Hipólito Avellanet González
- Patricia Avery – Elizabeth Anderson Avery
- Tex Avery – Frederick Bean Avery
- Val Avery – Sebouh Der Abrahamian
- Jane Avril – Jeanne Beaudon
- John Ayldon – John Arnold
- Ayo. – Joy Olasunmibo Ogunmakin
- Agnes Ayres – Agnes Eyre Henkel
- AZ – Anthony Cruz
- Trey Azagthoth – George Emmanuel, III
- Charles Aznavour – Shahnour Aznavurjan
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