Pat O'Brien (11 November 1899 – 15 Oktober 1983) was 'n Amerikaanse akteur en vervaardiger. Hy was bekend vir sy rolle in die rolprente Angels with Dirty Faces (1938), Knute Rockne All American (1940), Riffraff (1947), en Some Like It Hot (1959).
- 1931: Consolation Marriage
- 1931: Flying High
- 1931: The Front Page
- 1931: Personal Maid
- 1932: Air Mail
- 1932: American Madness
- 1932: The Final Edition
- 1932: Hell's House
- 1932: Hollywood Speaks
- 1932: Scandal for Sale
- 1932: The Strange Case of Clara Deane
- 1932: Virtue
- 1932: Flaming Gold
- 1933: Bureau of Missing Persons
- 1933: College Coach
- 1933: Destination Unknown
- 1933: Laughter in Hell
- 1933: The World Gone Mad
- 1934: Flirtation Walk
- 1934: Gambling Lady
- 1934: Here Comes the Navy
- 1934: I Sell Anything
- 1934: I've Got Your Number
- 1934: The Personality Kid
- 1934: Twenty Million Sweethearts
- 1935: Devil Dogs of the Air
- 1935: In Caliente
- 1935: The Irish in Us
- 1935: Oil for the Lamps of China
- 1935: Page Miss Glory
- 1935: Stars Over Broadway
- 1936: Ceiling Zero
- 1936: China Clipper
- 1936: I Married a Doctor
- 1936: Public Enemy's Wife
- 1937: Back in Circulation
- 1937: The Great O'Malley
- 1937: San Quentin
- 1937: Slim
- 1937: Submarine D-1
- 1938: Angels with Dirty Faces
- 1938: Boy Meets Girl
- 1938: Cowboy from Brooklyn
- 1938: Garden of the Moon
- 1938: Women Are Like That
- 1939: Indianapolis Speedway
- 1939: The Kid from Kokomo
- 1939: The Night of Nights
- 1939: Off the Record
- 1939: Slightly Honorable
- 1940: Knute Rockne All American
- 1940: 'Til We Meet Again
- 1940: Castle on the Hudson
- 1940: Escape to Glory
- 1940: The Fighting 69th
- 1940: Flowing Gold
- 1940: Torrid Zone
- 1942: Broadway
- 1942: Flight Lieutenant
- 1942: The Navy Comes Through
- 1942: Two Yanks in Trinidad
- 1943: Bombardier
- 1943: His Butler's Sister
- 1943: The Iron Major
- 1944: Marine Raiders
- 1944: Secret Command
- 1945: Having Wonderful Crime
- 1945: Man Alive
- 1946: Crack-Up
- 1946: Perilous Holiday
- 1947: Riffraff
- 1948: The Boy with Green Hair
- 1948: Fighting Father Dunne
- 1949: A Dangerous Profession
- 1950: The Fireball
- 1950: Johnny One-Eye
- 1951: Criminal Lawyer
- 1951: The People Against O'Hara
- 1951: The Hills of Ireland
- 1952: Okinawa
- 1954: Ring of Fear
- 1956: Inside Detroit
- 1957: Kill Me Tomorrow
- 1958: The Last Hurrah
- 1959: Some Like It Hot
- 1965: Town Tamer
- 1975: The Sky's the Limit
- 2017: The China Hustle
- 1960: Harrigan and Son
- 1977: Over Easy
- 1973: St. Patrick's Day Show
- 1980: Scout's Honor
- 1981: James Cagney: That Yankee Doodle Dandy
