Zac Efron as Troy Bolton

Vanessa Hudgens as Gabriella Montez

Ashley Tisdale as Sharpay Evans

Lucas Grabeel as Ryan Evans

Corbin Bleu as Chad Danforth

Monique Coleman as Taylor McKessie

Bart Johnson as Coach Jack Bolton

Alyson Reed as Ms. Darbus

Chris Warren as Zeke Baylor

Olesya Rulin as Kelsi Nielsen

Joey Miyashima as Principal Dave Matsui

Ryan Templeman as Skater Dude #2

Irene Santiago as Chem Teacher

Leslie Wing as Lucille Bolton

Joyce Cohen as Ms. Falstaff

Anne Kathryn Parma as Susan

Charles Klapow as Basketball Player Dancer

Brad Tobler as Basketball Player Dancer

Allison Holker as Cheerleader Dancer

Britt Stewart as Cheerleader Dancer

Mollee Gray as Brainiac Dancer

Michelle Parker as Braniac Dancer

Thayne Jasperson as Brainiac Dancer

Shawn Carter as Skaterdude Dancer

Malinda Money as Skaterdude Dancer

Dutch Whitlock as Skater Dude #1

Ryne Sanborn as Jason Cross

Socorro Herrera as Lisa Montez

Kaycee Stroh as Martha Cox

Brett Yoder as M.C.

Sarah K. Aezer as Girl #1

Amanda Garrett as Girl #2

Nick Whitaker as Alan

Falon Grace as Cyndra

Sami Roe as Weird Kid #1

Melissa Hildebrant as Weird Kid #2

David Huff as Basketball Player Dancer

Jared Murillo as Basketball Player Dancer

Roger Malaga as Basketball Player Dancer

Todd Michael Schwartzman as Basketball Player Dancer

Da' Jon Lang as Basketball Player Dancer

Tina Pituckul as Cheerleader Dancer

Raquel Goodsell as Cheerleader Dancer

Kelli Baker as Cheerleader Dancer

Bayli Baker as Cheerelader Dancer

Jessie Tan as Cheerleader Dancer

Breanna Phillips as Cheerleader Dancer

Skyler Holman as Brainiac Dancer

Andrew Winston as Brainiac Dancer

Afton Delgrosso as Brainiac Dancer

Falisha Fehoko as Brainiac Dancer

Eldon Johnson as Skater Dude Dancer

Josh Murillo as Skater Dude Dancer

Sabra Johnson as Skater Dude Dancer

Drew Seeley as Troy Bolton (singing voice) (uncredited)

Tisha Vaculin as Cheerleader Dancer (uncredited)

Joseph Paul Branca as Student (uncredited)

Joe Cappelletti as Basketball Championship Announcer (uncredited)

Matthew Miles Carter as Basketball Player Dancer (uncredited)

Kara Dupell as Cheerleader Dancer (uncredited)

Jason Fullmer as Student (uncredited)

Joe Jurisic as Chapstick (uncredited)

Bryson Kuan as Student (uncredited)

Camille Lynne Matthews as Cafe Dancer (uncredited)

Chase Ramsey as Jock (uncredited)

Stephen Rippey as Referee (uncredited)

Carleton Bluford as Basketball Player Dancer