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Henry O'Neill (1891–1961) was an American film actor known for playing gray-haired fathers, lawyers, and similarly roles during the 1930s and 1940s.
O'Neill began his acting career on the stage, after dropping out of college to join a traveling theatre company. He served in the military in World War I, then returned to the stage.
In the early 1930s he began appearing in films, including The Big Shakedown, Santa Fe Trail, Anchors Aweigh, The Green Years, and The Reckless Moment. His last film was The Wings of Eagles.
Henry O'Neill died in 1961 at the age of 69.

Santa Fe Trail
Cyrus Brody
56

Jezebel
General Theopholus Bogardus
69

Holiday Affair
Mr. Crowley
68

The Get-Away
Warden Alcott
54

Nothing But Trouble
Mr. Hawkley
60

The Heavenly Body
Professor Stowe
53

Castle on the Hudson
District Attorney
68

Scandal Sheet
Charlie Barnes
69

The Walking Dead
District Attorney Werner
63

Alias Nick Beal
Judge Ben Hobbs
66

Bullets or Ballots
Ward Bryant
65

The Reckless Moment
Tom Harper
67

No Man of Her Own
Mr. Harkness
68

Girl Crazy
Mr. Danny Churchill, Sr.
54

Johnny Eager
Mr. Verne
60

Convicted
Detective Dorn
60

Strange Bargain
Timothy Hearne
57

The People Against O'Hara
Judge Keating
57

Shadow of the Thin Man
Major Jason I. Sculley
70

Midnight
Edgar V. Ingersoll
48

The Florentine Dagger
Victor Ballau
57

A Guy Named Joe
Col. Sykes
66

Thousands Cheer
Captain in Frank Morgan Skit (uncredited)
64

Knute Rockne All American
Doctor
61

Lady Killer
Ramick
69

The Second Woman
Ben Sheppard
55

Air Raid Wardens
Rittenhause
71

The Wings of Eagles
Capt. Spear
62

The Amazing Dr. Clitterhouse
Judge
71

Untamed
Squire O'Neill
56

Dodge City
Colonel Dodge
69

The Human Comedy
Charles Steed
61

Two Girls and a Sailor
John Dyckman Brown II
57

Special Agent
District Attorney Roger Quinn
62

You're My Everything
Prof. Adams
38

The Key
Dan
46

Fashions of 1934
Duryea
64

Whistling in the Dark
Philip Post
58

The Man with Two Faces
Inspector Crane
66

Whistling in Brooklyn
Inspector Holcomb
63

The Story of Louis Pasteur
Dr. Emile Roux
68

Blossoms in the Dust
Judge
66

Flirtation Walk
Gen. John "Jack" Brent Fitts
56

Black Fury
John W. Hendricks
61

The Beginning or the End
Gen. Thomas F. Farrell
61

Racket Busters
Governor
51

Juarez
General Miguel Miramon
65

The Great O'Malley
Defense Attorney
67

Honky Tonk
Daniel Wells
64

The Big Shakedown
Mr. Sheffner
56

Tortilla Flat
Father Ramon
55

Dr. Ehrlich's Magic Bullet
Dr. Lentz
65

This Time for Keeps
Arthur Freeman
60

The Bugle Sounds
Lt. Col. Harry Seton
60

White Cargo
The Reverend Dr. Roberts
58

The House on 56th Street
Baxter - the Laywer (uncredited)
45

The Green Years
Canon Roche
62

Two Against the World
Jim Carstairs
58

The Sun Shines Bright
Joe D. Habersham
64

I Loved a Woman
Mr. Farrell
45

Men of Boys Town
Mr. Maitland
61

Angels Wash Their Faces
A.H. Remson
64

First Lady
George Mason
62

Dangerous Partners
Duffy
60

Billy the Kid
Tim Ward
49

Wells Fargo
Henry Wells
52

Bedside
Dr. William Chester
54

The Personality Kid
Stephens
37

Brother Rat
Colonel Ramm
50

Wonder Bar
Richard
58

The Case of the Lucky Legs
District Attorney C. Manchester
56

'Til We Meet Again
Dr. Cameron
62

The Man Who Reclaimed His Head
Fernand de Marnay
60

Now I'll Tell
Tommy Doran
43

Submarine D-1
Admiral Thomas
47

Lost Angel
Professor Josh Pringle
75

Sweet Music
Louis Trumble
57

Torchy Blane in Chinatown
Sen. H. Baldwin
60

Boulder Dam
Mr. Agnew
50

Stranded
Mr. Tuthill
58

Midnight Alibi
Ardsley
60

The Great Hotel Murder
Mr. Claude Harvey
58

Girls on Probation
Judge
59

Lucky Night
Calvin Jordan
66

From Headquarters
Inspector Donnelly
57

Side Streets
George Richards
45

The World Changes
Orin Nordholm Sr.
43

Massacre
J.R. Dickinson
53

The Return of October
President Hotchkiss
58

Rationing
Senator Edward White
27

Road Gang
George Winston
65

Living on Velvet
Harold Thornton
55

Mr. Dodd Takes the Air
D.M. Gateway
54

The Go-Getter
Commander Tisdale
58

Dr. Socrates
Greer
64

Everybody's Hobby
Thomas 'Tom' Leslie
57

The Flying Missile
Thomas A. Scott
49

Money and the Woman
Mr. Mason
35

Dinky
Col. Barnes
67

Scarlet Angel
Morgan Caldwell
51

The Family Secret
Donald Muir
57

Madame du Barry
Duc de Choiseul
41

I've Got Your Number
Mr. John P. Schuyler
60

Sons of Liberty
Member of Continental Congress
62

Bordertown
Attorney J.L. Chase (uncredited)
59

White Banners
Sam Trimble
58

We're in the Money
Stephen Dinsmore
55

Anchors Aweigh
Admiral Hammond
68

The Virginian
Mr. Taylor
60

Gold Is Where You Find It
Judge
69

Upperworld
Banker Making Toast
63

A Child Is Born
Dr. Lee
65

Leather Gloves
Dudley
0

Barbary Coast Gent
Colonel Watrous
46

Twenty Million Sweethearts
Lemuel Tappan
60

Born to Sing
Frank Eastman
50

The Man Who Dared
Matthew Carter
50

The Fighting 69th
Colonel
55

Fog Over Frisco
Oren Porter
62

Draegerman Courage
Dr. Thomas Haslett
65

Alias Mary Dow
Henry Dow
62

Personal Maid's Secret
Mr. Wilton Palmer
55

Gentlemen Are Born
Mr. Harper
65

Oil for the Lamps of China
Edward Hartford
73

The Big Noise
Charlie Caldwell
50

Calling Philo Vance
Markham
59

The White Angel
Dr. Scott
72

Confessions of a Nazi Spy
Attorney Kellogg
60

Four Wives
Dr. Clinton Forrest, Sr.
53

Journal of a Crime
Doctor
57

Wings of the Navy
Prologue Speaker
60

While the Patient Slept
Elihu Dimuck
64

The Singing Marine
Captain Skinner
40

Dark Shadows
Dr. Everett Colner
91

Best Foot Forward
Maj. Roger W. Reeber
60

Service with the Colors
Colonel Nelson
50

Rainbow on the River
Father Josef
80

Son of a Sailor
Naval Officer
50

The Trial of Mary Dugan
Galway
50

The Golden Arrow
Mr. Appleby
61

The Secret Bride
Jim Lansdale
59

Freshman Love
President Simpkins
60

Bad Bascomb
Gov. Winton
62

The Hoodlum Saint
Lewis J. Malbery
52

They Drive by Night
District Attorney (uncredited)
69

The Life of Emile Zola
Colonel Picquart
67

Bright Lights
J.C. Anderson
42

Down in San Diego
Col. Halliday
55

Three Wise Fools
Prof. Horace Appleby
50

A Trip Thru a Hollywood Studio
Director (uncredited)
52

Little Mister Jim
Chaplain
40

This Man's Navy
Lt. Cmdr. Roger Graystone
64

For God and Country
Captain Chaplain
0

Anthony Adverse
Father Xavier
56

Green Light
Dr. Endicott
64

Big Hearted Herbert
Goodrich Sr.
35

Murder in the Clouds
John Brownell
47

The Milkman
Bradley, Sr.
80

Yellow Jack
Gorgas
56

Stand by for Action
Cmdr. Stone M.C
68

Marked Woman
Arthur Sheldon
65

The Kennel Murder Case
Dubois (uncredited)
60

The Chaser
Mr. Calhoun
60
Young America Flies
Dr. Webster
0

Main Street Today
Vance Clark
62

Dr. Gillespie's Criminal Case
Warden Kenneson
55
The Right Way
Mr. Martin
0

Between Two Women
Larry Goff - Theatrical Agent (uncredited)
59

Keep Your Powder Dry
Maj. Gen. Lee Rand
59

Invisible Stripes
Parole Officer Masters
60