Full cast of United States of Tara

Toni Collette

Tara Gregson

36 episodes

John Corbett

Max Gregson

36 episodes

Rosemarie DeWitt

Charmaine

36 episodes

Keir Gilchrist

Marshall Gregson

36 episodes

Brie Larson

Kate Gregson

36 episodes

Michael J. Willett

Lionel

16 episodes

Nate Corddry

Gene Stuart

3 episodes

Patton Oswalt

Neil

3 episodes

Griffin Gluck

Monty

3 episodes

Hayley McFarland

Petula

3 episodes

Stephanie Courtney

Beth

2 episodes

Dan Bakkedahl

Mr. Kern

2 episodes

Viola Davis

1 episode

Michael Hitchcock

1 episode

Shiloh Fernandez

1 episode

Sammy Sheik

1 episode

Lance Barber

1 episode

Valerie Mahaffey

Dr. Ocean

1 episode

Tony Hale

Orel Gershenoff

1 episode

Miki Ishikawa

Olivia

1 episode

Patricia Belcher

Gloria

1 episode

Andy Mackenzie

Mustachioed Man

1 episode

Ryan Eggold

Tevin

1 episode