Freddie Highmore as August Rush

Keri Russell as Lyla Novacek

Jonathan Rhys Meyers as Louis Connelly

Terrence Howard as Richard Jeffries

Robin Williams as Maxwell "Wizard" Wallace

William Sadler as Thomas Novacek

Marian Seldes as The Dean

Mykelti Williamson as Reverend James

Leon Thomas III as Arthur

Aaron Staton as Nick

Alex O'Loughlin as Marshall

Jamia Simone Nash as Hope

Ronald Guttman as Professor

Bonnie McKee as Lizzy

Michael Drayer as Mannix

Jamie O'Keeffe as Steve

Becki Newton as Jennifer

Tyler McGuckin as Peter

Megan Gallagher as Megan

Anais Martinez as Backbeat

Bilal Bishop as Roller Bull

Michael R. Hammonds II as Feedback

Timmy Mitchum as Joey

Henry Caplan as Bill

John Knox as Club Manager

Amy V. Dewhurst as Receptionist

Victor Verhaeghe as Cop

Darrie Lawrence as Old Neighbor

Sean Haberle as Frank

Jamal Joseph as Driver

Robert Aberdeen as Record Executive

Georgia Creighton as Apartment Owner

Joshua Jaymz Doss as Orphanage Kid

Craig Johnson as Orphanage Boy

Dominic Colón as Policeman

Zach Page as Child Guitar Player

Charles Mack as Gospel Soloist

Amma Agyapon as Gospel Singer

Adia Beckford as Gospel Singer

Dietrice A. Bolden as Gospel Singer

Dina Gardener as Gospel Singer

Luther Isler as Gospel Singer

Raymond Johnson as Gospel Singer

Joyce Walker Joseph as Gospel Singer

Willana Mack as Gospel Singer

Lamar Antwon Robinson as Gospel Singer

Talif Showers as Gospel Singer

Carlton Taylor as Gospel Singer

Yvette Bodrick as Street Sound Circle

Crystal A. Elliott as Street Sound Circle

Jindai Joseph as Street Sound Circle

Jacquelen Singleton as Street Sound Circle

Travis Veada as Street Sound Circle

Jasmine Pauline Wigfall as Street Sound Circle

John Farrer as Violinist (uncredited)