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

Olesya Rulin as Kelsi Nielsen

Chris Warren as Zeke Baylor

Monique Coleman as Taylor McKessie

Ryne Sanborn as Jason Cross

Kaycee Stroh as Martha Cox

Mark L. Taylor as Thomas Fulton

Robert Curtis Brown as Vance Evans

Jessica Tuck as Darby Evans

Bart Johnson as Coach Jack Bolton

Alyson Reed as Ms. Darbus

Tanya Chisholm as Jackie

Miley Cyrus as Girl at Pool

Kelli Baker as Lea

McCall Clark as Emma

Manly "Little Pickles" Ortega as Boi Evans

Leslie Wing as Lucille Bolton

Jaymz Tuaileva as Javier / Principal Dancer

Annette Wright as Mrs. Hoffenfeffer

K. Danor Gerald as Player

Charan Prabhakar as Assistant Pro

David Nibley as Man #2

Dave Fox as Coach Reynolds

Charles Hajek as Valet

Charles Klapow as Principal Dancer

Shawn Carter as Principal Dancer

Mollee Gray as Principal Dancer

Shane Harper as Principal Dancer

Bayli Baker as Principal Dancer

David Huff as Principal Dancer

Kimberly Klapow as Principal Dancer

Roger Malaga as Principal Dancer

Jared Murillo as Principal Dancer

Doug Penikas as Principal Dancer

Tyne Stecklein as Principal Dancer

Britt Stewart as Principal Dancer

Andrew Winston as Principal Dancer

Sarah K. Aezer as East High Dancer

Christian Denice as East High Dancer

Craig De Rosa as East High Dancer

Raquel Goodsell as East High Dancer

Allison Holker as East High Dancer

Thayne Jasperson as East High Dancer

Michelle Parker as East High Dancer

Safari Natalia Sorenson as East High Dancer

Hefa Leone Tuita as East High Dancer

Lisa Whittaker as East High Dancer

Danny Axley as Baseball Dancer

Abe Leon Fullmer as East High Dancer

Italo Elgueta as Baseball Dancer

Nick Lanzisera as Baseball Dancer

Gevorg Manoukian as Baseball Dancer

Ryan Novak as Baseball Dancer

Alan Salazar as Baseball Dancer

Brittany Hipp as Synchronized Swimmer

Amanda Godinez as Synchronized Swimmer

Catherine Smith as Synchronized Swimmer

Quinn Linde as Baseball Player

Adam Gunn as Baseball Player

Derek Bundy as Baseball Player

Scott Hoopes as Baseball Player

Berkeley Ward as Baseball Player

Dakota Larsen as Baseball Player

Johnny Ahn as Dancer (uncredited)

Joseph Paul Branca as Dancer (uncredited)

Chevy Lamont Cofield as Party Dancer (uncredited)

Amanda Garrett as Dancer (uncredited)

Mike Handy as Basketball Booster (uncredited)

Michael McQuain as Wealthy College Booster (uncredited)

Brandon O'Neal as Dancer (uncredited)

Joseph Winter as Bass Guitar Player (uncredited)