- Phyllis Coates – Gypsie Ann Evarts Stell
- Lee J. Cobb – Leon Jacob
- Coco Marie (a.k.a. Coco-T) – Nicole Natalie Austin
- CocoRosie Bianca "Coco" Casady and Sierra "Rosie" Casady
- Cocoa Tea – Calvin George Scott
- Ian Cognito – Paul Barbieri
- Claudette Colbert – Émilie Claudette Chauchoin
- Anita Colby – Anita Counihan
- Chanel Cole – Chanel Cole Whalley
- Cozy Cole – William Randolph Cole
- Nat King Cole – Nathaniel Adams Coles
- Cy Coleman – Seymour Kaufman
- Jaybird Coleman – Burl Coleman
- Collette – Collette Roberts
- Constance Collier – Laura Constance Hardie
- William Collier Jr. – Charles F. Gal, Jr.
- Bootsy Collins – William Earl Collins
- Careena Collins – Sandee Johnson
- Jo Collins – Janet Canoy
- June Collyer – Dorothea Heermance
- Jessi Colter – Mirriam Johnson
- Robbie Coltrane – Anthony Robert McMillan
- Russ Columbo – Ruggiero Eugenio di Rodolpho Colombo
- Shawn Colvin – Shanna Colvin
- Aaron Cometbus - Aaron Elliot
- Franché Coma – Frank Licata
- Common – Lonnie Rashied Lynn
- Perry Como – Pierino Como
- Betty Compson – Eleanor Luicime Compson
- Betty Compton – Violet Halling Compton
- Fay Compton – Virginia Lilian Emeline Compton Mackenzie
- Heinie Conklin – Charles John Conklin
- Didi Conn – Edith Bernstein
- Nadine Conner – Evelyn Nadine Henderson
- Chuck Connors – Kevin Joseph Connors
- Robert Conrad – Conrad Robert Norton Falk
- William Conrad – John William Cann, Jr.
- Eddie Constantine – Edward Constantinowsky
- Richard Conte – Nicholas Peter Conte
- Bert Convy – Bernard Whalen Convy
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- Gary Conway – Gareth Monello Carmody
- Karla Conway – Karla Jo Musacchia
- Russ Conway (actor) – Russell Clarence Zink
- Tim Conway – Thomas Daniel Conway
- Tom Conway – Thomas Charles Sanders
- Jackie Coogan – John Leslie Coogan
- Keith Coogan – Keith Eric Mitchell
- Carole Cook – Mildred Frances Cook
- Doc Cook – Charles Cooke
- Spade Cooley – Donnell Clyde Cooley
- Coolio – Artis Leon Ivey, Jr.
- Tré Cool – Frank Edwin Wright, III
- Alice Cooper – Vincent Damon Furnier (legally changed his name to Alice Cooper after quitting the original band 'Alice Cooper' so he could use the name)
- Gary Cooper – Frank James Cooper
- Pat Cooper – Pasquale Caputo
- Joan Copeland – Joan Maxine Miller
- David Copperfield – David Seth Kotkin
- Copywrite – Peter James Nelson
- Barry Corbin – Leonard Barrie Corbin
- Mara Corday – Marilyn Joan Watts
- Jeff Corey – Arthur Zwerling
- Jill Corey – Norma Jean Speranza
- Corneille – Corneille Nyungura
- Chris Cornell – Christopher John Boyle
- Don Cornell – Louis Valaro
- Isabela Corona – Refugio Pérez Frías
- Tony Corsari – André Mathilde Édouard Parengh
- Corsica Joe – François Miquet
- Bud Cort – Walter Edward Cox
- Baby Cortez – David Cortez Clowney
- Ricardo Cortez – Jacob Krantz
- Howard Cosell – Howard William Cohen
- Elvis Costello – Declan Patrick MacManus
- Lou Costello – Louis Francis Cristillo
- Antony Cotton – Antony Dunn
- Josie Cotton – Kathleen Josey
- John Cougar – John Mellencamp
- Jayne County (formerly known as Wayne County) – Wayne Rogers
- Jacqueline Courtney – Sharon Courtney
- Desireé Cousteau – Deborah Clearbranch
- Bucky Covington – William Joel Covington, III
- Cowboy Troy – Troy Coleman
- Jane Cowl – Grace Bailey
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- Peter Coyote – Rachmil Pinchus Ben Mosha Cohon
- Carl Crack – Carl Bohm
- James Craig – James Henry Meador
- Norma Crane – Norma Anna Bella Zuckerman
- Darby Crash - Jan Paul Beahm
- Joan Crawford – Lucille Fay LeSueur (known as Billie Cassin before taking the name "Joan Crawford")
- Michael Crawford – Michael Patrick Smith
- Randy Crawford – Veronica Crawford
- Justin Credible – Peter Joseph Polaco
- Consequences Creed – Austin Watson
- Donald Crisp – George William Crisp
- Quentin Crisp – Denis Charles Pratt
- Criss Angel – Christopher Nicholas Sarantakos
- Peter Criss – George Peter John Criscoula
- Linda Cristal – Marta Victoria Moya Burges
- Cristina (singer) – Cristina Monet-Palaci
- John Cromwell – Elwood Dager Cromwell
- Bing Crosby – Harry Lillis Crosby
- Christopher Cross – Christopher Geppert
- Scatman Crothers – Benjamin Sherman Crothers
- Tom Cruise – Thomas Cruise Mapother, IV
- Rayver Cruz – Raymond Oliver Cruz Ilustre
- James Cruze – Jens Vera Cruz Bosen
- Xavier Cugat – Francesc d'Asís Xavier Cugat Mingall de Bru i Deulofeu
- Stan Cullimore – Ian Peter Cullimore
- Zara Cully – Zara Frances Cully Brown
- Smiley Culture – David Victor Emmanuel
- Constance Cummings – Constance Halverstadt
- Irving Cummings – Irving Camisky
- Susan Cummings – Suzanne Gerda Tafel
- Grace Cunard – Harriet Mildred Jeffries
- Michael Currie – Herman Christian Schwenk, Jr.
- Betty Curse – Megan Burns
- Phyllis Curtin – Phyllis Smith
- Alan Curtis (U.S. actor) – Harry Ueberroth
- King Curtis – Curtis Ousley
- Tony Curtis – Bernard Schwartz
- Michael Curtiz – Manó Kertész Kaminer (later known as Mihály Kertész)
- Cut Killer – Anouar Hajoui
- Miley Cyrus – Destiny Hope Cyrus (but later changed name legally to Miley Cyrus)
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