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Acting
Pat O'Brien (born William Joseph Patrick O'Brien) was an American stage, screen, radio, and television actor. He was a star during the first several years of his film career, the height of his popularity being during the 1930s and 1940s.

Classic Movie Bloopers: Uncensored
as Self (archive footage)

You Must Remember This: The Warner Bros. Story
as Self (archive footage)

Angels with Dirty Faces: Whaddya Hear? Whaddya Say?
as Self (archive footage)

Dill Scallion
as Self

Hollywood Out-takes and Rare Footage
as Self (archive footage) (uncredited)
James Cagney: That Yankee Doodle Dandy
as Self

Ragtime
as Delmas

Scout's Honor
as Mr. Caboose

WKRP in Cincinnati

The End
as Ben Lawson

Billy Jack Goes to Washington
as President of the Senate

Kiss Me... Kill Me
as Jimmy, the morgue attendant

The Sky's the Limit
as Abner Therman

Happy Days

Amanda Fallon
as Emory

Banyon

The Adventures of Nick Carter
as Hallelujah Harry

Welcome Home, Johnny Bristol
as Sgt. McGll

Alias Smith and Jones

The Phynx
as Pat O’Brien

McCloud

The Over the Hill Gang
as Captain Oren Hayes

Town Tamer
as Judge Murcott

Branded

Kraft Suspense Theatre
as Lt. John Curwood
Bob Hope Presents the Chrysler Theatre

Going My Way

The Merv Griffin Show
as Self

The Tonight Show Starring Johnny Carson
as Self

The Virginian
as J. Jimerson Jones

The Road to Hong Kong
as Chinese Restaurateur (uncredited)

Babe Ruth Story: That Ever Livin' Babe
as Narrator

The Mike Douglas Show
as Self - Co-Host
The Best of the Post
as Mike Breen

Harrigan and Son

I Captured the King of the Leprechauns
as Self

Some Like It Hot
as Detective Mulligan

The Last Hurrah
as John Gorman

Kraft Music Hall
as Self

Kill Me Tomorrow
as Bart Crosbie

Invitation to a Gunfighter
as Sheriff Kyle Bickford

Telephone Time

Inside Detroit
as Gus Linden

Science Fiction Theatre

Climax!
as Police Lieutenant Moore

Ring of Fear
as Frank Wallace

Jubilee Trail
as Ernest 'Texas' Conway

General Electric Theater
as Major Irish

The Ford Television Theatre
as Lt. V. Keever

This Is Your Life
as Self

Okinawa
as Lt. Cmdr. Hale

Schlitz Playhouse of Stars

The People Against O'Hara
as Det. Vincent Ricks

Criminal Lawyer
as James 'Jimmy' Regan
The Hills of Ireland
as Self - Narrator

The Fireball
as Father O'Hara
Lux Video Theatre
as Tim Larkin

The Colgate Comedy Hour
as Self

Johnny One-Eye
as Martin Martin

What's My Line?
as Self