Tom Sawyer, Detective

Billy Cook

— Tom Sawyer

Donald O'Connor

— Huckleberry Finn

Porter Hall

— Uncle Silas Phelps

Phil Warren

— Jeff Rutledge

Janet Waldo

— Ruth Phelps

Elisabeth Risdon

— Aunt Sally Phelps

William Haade

— Jupiter Dunlap / Jake Dunlap

Edward Pawley

— Brace Dunlap

Clem Bevans

— Sheriff "Turkeyneck" Slocum

Raymond Hatton

— Judge Tyler

Howard M. Mitchell

— Elmer Hawkins, Prosecutor

Stanley Price

— Clayton

Harry Worth

— Dixon

Clara Blandick

— Aunt Polly

Si Jenks

— Farmer Sykes

Etta McDaniel

— Tulip

Oscar Smith

— Curfew

Monte Blue

— Sheriff Walker

Foy Van Dolsen

— Alex Cooper