Don't Weaken!

Ford Sterling

Professor Yonson - the Dancing Master

James Finlayson

Lightfingered Luke - Professor Yonson's Assistant

Charles Murray

Frank Reilly

Fanny Kelly

Reilly's Wife

Harriet Hammond

Reilly's Daughter

Joseph Belmont

Reilly's Daughter's Beau

Billy Armstrong

The Pianist (uncredited)

Lige Conley

Reilly's Poker Pal (uncredited)

Al Cooke

The Butler (uncredited)

Virginia Fox

Dance Pupil (uncredited)

Eddie Gribbon

Dance Pupil (uncredited)

Patrick Kelly

The Timekeeper (uncredited)