Full Cast — The Big Bang Theory (2007–2019)
Johnny Galecki
Leonard Hofstadter
Jim Parsons
Sheldon Cooper
Kaley Cuoco
Penny
Simon Helberg
Howard Wolowitz
Kunal Nayyar
Rajesh Koothrappali
Melissa Rauch
Bernadette Rostenkowski
Mayim Bialik
Amy Farrah Fowler
Kevin Sussman
Stuart Bloom
Carol Ann Susi
Debbie Wolowitz (voice)
John Ross Bowie
Barry Kripke
Laura Spencer
Emily Sweeney
Wil Wheaton
Wil Wheaton
Brian George
V.M. Koothrappali
Christine Baranski
Beverly Hofstadter
Brian Posehn
Bert Kibbler
Laurie Metcalf
Mary Cooper
Joshua Malina
President Siebert
Aarti Mann
Priya Koothrappali
Brian Thomas Smith
Zack Johnson
Pamela Adlon
Halley Wolowitz (voice)
Sara Gilbert
Leslie Winkle
Rati Gupta
Anu
Kate Micucci
Lucy
Lauren Lapkus
Denise
Stephen Hawking
Stephen Hawking
Dean Norris
Richard Williams
Casey Sander
Mike Rostenkowski
Michael J. Massimino
Michael J. Massimino
Regina King
Janine Davis
Bob Newhart
Arthur Jeffries
Alessandra Torresani
Claire
Vernee Watson
Althea
Mark Harelik
Eric Gablehauser
Ed Lieberman
Man V.O. (voice) / Announcer (voice) / Man / Lecturer (voice)
Keith Carradine
Wyatt Teller
Pasha D. Lychnikoff
Dimitri
Margo Harshman
Alex Jensen
Robert Clotworthy
Dave Roeger (voice) / Announcer (voice) / Astronaut (voice) / Train Conductor (voice)
Brian Patrick Wade
Kurt
LeVar Burton
LeVar Burton
Riki Lindhome
Ramona Nowitzki
Kimberly Brooks
Automated Cell Phone Voice (voice) / Computer (voice)
Swati Kapila
Ruchi
Stephen Merchant
Dave Gibbs
Marcus Folmar
Security Guard / Police Officer
Sara Rue
Stephanie Barnett
Ira Flatow
Ira Flatow / Ira Flatow (voice)
Ian Scott Rudolph
Captain Sweatpants (uncredited) / Captain Sweatpants
Jerry O'Connell
Georgie Cooper
Kathy Bates
Mrs. Fowler
Teller
Larry Fowler
Kal Penn
Kevin Campbell
Sean Astin
Greg Pemberton
Erin Allin O'Reilly
Cheryl
James Hong
Chen
Stephen Root
Dan
Dakin Matthews
Santa Claus
Jim Meskimen
Doctor (voice) / Minister
Elena Campbell-Martinez
Maria
Alex Ball
Waiter
Judd Hirsch
Alfred Hofstadter
Annie O'Donnell
Mrs. Fowler / Mrs. Lorvis (voice)
Molly Morgan
Hostess / Bethany
Katie Leclerc
Emily
Katee Sackhoff
Katee Sackhoff
David Trice
Waiter
Josh Brener
Dale
Kevin Brief
Glen / Security Guard
Lance Barber
George Cooper / Jimmy Speckerman
Lio Tipton
Analeigh Tipton / Vanessa Bennett
Bill Nye
Bill Nye
Neil deGrasse Tyson
Neil deGrasse Tyson
Courtney Henggeler
Missy Cooper
Chasty Ballesteros
Karen
David Theune
Dr. Graybel
Michelle Arthur
Mrs. Petrescu
Kevin Smith
Kevin Smith
Caleb Pierce
Jess
Lindsey Kraft
Marissa Johnson
Ellen DeGeneres
Ellen DeGeneres
George F. Smoot
George F. Smoot