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Walter Andrew Brennan (July 25, 1894 – September 21, 1974) was an American actor and singer. He won the Academy Award for Best Supporting Actor for his performances in Come and Get It (1936), Kentucky (1938), and The Westerner (1940), making him one of only three male actors to win three Academy Awards. Brennan was also nominated for his performance in Sergeant York (1941). Other noteworthy performances were in To Have and Have Not (1944), My Darling Clementine (1946), Red River (1948), and Rio Bravo (1959).
Description above from the Wikipedia article Walter Brennan, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Rio Bravo
Stumpy
78

The Movie Orgy
Self (archive footage)
63

My Darling Clementine
Old Man Clanton
74

Red River
'Groot' Nadine
73

Spangles
Lunch Counterman (uncredited)
0

The Adventures of Tom Sawyer
Muff Potter
66

The Princess and the Pirate
Featherhead
69

Hangmen Also Die!
Prof. Stephen Novotny
69

Support Your Local Sheriff!
Pa Danby
69

Golden Saddles, Silver Spurs
(archive footage)
0

To Have and Have Not
Eddie
74

Home for the Holidays
Benjamin Morgan
53

The Gnome-Mobile
D.J. Mulrooney / Knobby
61

How the West Was Won
Jeb Hawkins
69

Meet John Doe
The Colonel
73

Nobody Lives Forever
Pop Gruber
62

Nice Girl?
Hector Titus
53

The Rustler's Roundup
Walt (uncredited)
0

Bad Day at Black Rock
Doc T.R. Velie Jr.
73

Fury
Bugs Meyers
74

Blood on the Moon
Kris Barden
62

Prescott Kid
Zeke - Stage Driver
0

The Westerner
Judge Roy Bean
70

Those Calloways
Alf Simes
63

Tammy and the Bachelor
John Dinwitty
69

A Stolen Life
Eben Folger
63

Task Force
Pete Richard
70

Flashing Oars
Hula Hula Hut Customer
23

Northwest Passage
'Hunk' Marriner
65

Along the Great Divide
Timothy 'Pop' Keith
73

Who's Minding the Mint?
Pop Gillis
70
The Iceman's Ball
Officer Dugan
10

Swamp Water
Tom Keefer
63

Sergeant York
Pastor Rosier Pile
71

The One and Only, Genuine, Original Family Band
Grandpa Bower
60

The North Star
Karp
61

The Story of Vernon and Irene Castle
Walter
69

The Mystery of Edwin Drood
Milkman (uncredited)
56

The Far Country
Ben Tatum
68

Rise and Shine
Grandpa
60

Breakdowns of 1941
Self (archive footage) (uncredited)
70

The Pride of the Yankees
Sam Blake
74

Once in a Lifetime
Lighting Technician (uncredited)
70

These Three
Taxi Driver
71

The Over the Hill Gang
Nash Crawford
56

The Oscar
Quentin
48

Man on the Flying Trapeze
'Legs' Garnett
60

Two-Fisted Law
Bendix the Deputy Sheriff
46

Barbary Coast
Old Atrocity
63

Come and Get It
Swan Bostrom
68

The Impatient Maiden
Cigar Stand Proprietor (uncredited)
0

Dakota
Bounce of the Riverbird
51

Helldorado
Pete
0

The Showdown
Cap MacKellar
52

The Over-the-Hill Gang Rides Again
Nash Crawford
50

Stanley and Livingstone
Jeff Slocum
63

Stand by for Action
Chief Yeoman Henry Johnson
68

Law and Order
Lanky Smith (uncredited)
49

Driftwood
Murph
61

Drums Across the River
Sam Brannon
56

The Moon's Our Home
Lem
66

At Gunpoint
Doc Lacy
63

The Proud Ones
Jake
63

The Texans
Chuckawalla
56

Come Next Spring
Jeffrey Storys
55

The Cowboy and the Lady
Sugar
62

Best of the Badmen
'Doc' Butcher
65

Woman Haters
Train Conductor (uncredited)
60

They Shall Have Music
Professor Lawson
62

The Buccaneer
Ezra Peavey
64

Scudda Hoo! Scudda Hay!
Tony Maule
47

Singing Guns
Dr. Jonathan Mark
60

Manhattan Tower
Mechanic (uncredited)
59

Kentucky
Peter Goodwin
58

Centennial Summer
Jesse Rogers
55

The Calgary Stampede
Racing Spectator in Grandstand at Rodeo (uncredited)
52

A Ticket to Tomahawk
Terence Sweeny
58

Three Godfathers
Samuel 'Gus' Barton
68

Banjo on My Knee
Newt Holley
55

Smilin' Guns
Ranch Foreman
0

The Lariat Kid
Pat O'Shea
0

The Wild Blue Yonder
Maj. Gen. Wolfe
60

Surrender
Sheriff Bill Howard
44

Flight
Marine Pilot
63

The Men Who Made the Movies: Howard Hawks
Self (archive footage)
68

Honeymoon Lane
Driver
0

Restless Knights
Father (uncredited)
59

Girl Missing
Joe, Garage Attendant (Uncredited)
46

Glory
Ned Otis
50

Slightly Dangerous
Cornelius Burden
60

Seven Keys to Baldpate
Station Agent
66

There's Always Tomorrow
Auto mechanic
80

Curtain Call at Cactus Creek
Rimrock
62

Home in Indiana
J. F. 'Thunder' Bolt
55

The Young Country
Sheriff Matt Fenley
80

Maryland
William P. Stewart
62
Radio Dough
Drunk Customer (uncredited)
0

Two for the Money
Cody Guilford
60

Mother Carey's Chickens
Ossian Popham
52

Affairs of Cappy Ricks
Cappy Ricks
43

Brimstone
Pop Courteen
63

Metropolitan
Grandpa
0

Lady Tubbs
Joseph
50

She's Dangerous
'Oats'
50

Four Guns to the Border
Simon Bhumer
49

Lure of the Wilderness
Jim Harper
59

Gridiron Flash
Proprietor of Java Joe's
33

We're in the Money
Wedding Witness (uncredited)
55

Miss Pinkerton
Police Dispatcher (uncredited)
57

Grief Street
Walt
39

Dames Ahoy
Side Show Barker
0

Return of the Texan
Grandpa Firth Crockett
60

Cross Country Cruise
Niagara Falls Boatman (Uncredited)
60

See America Thirst
Spumoni Bodyguard (uncredited)
0

One Year Later
Man Chuckling at Train Station
63

The Wedding Night
Bill Jenkins
58

The Unexpected Father
Sailor (uncredited)
0

My Woman
Auditioning Man Who Does Animal Sounds (Uncredited)
36

The Michigan Kid
Minor Role (uncredited)
0

Land of Liberty
Ezra Peavey (edited from 'The Buccaneer')
0

Lorraine of the Lions
Minor Role (uncredited)
55

Sensation Seekers
Below Deck Yacht Crewman
64

The Green Promise
Mr. Matthews
60

Scandal for Sale
Newspaperman
70

Good-bye, My Lady
Uncle Jesse Jackson
77

God Is My Partner
Dr. Charles Grayson
50

I'll Tell the World
Otto - Bicycle Repair Man
0

Tearin' Into Trouble
Billy Martin
0

The Ridin' Rowdy
0

The Ballyhoo Buster
0

King of Jazz
Desk Sergeant ('Springtime') / Soldier ('All Noisy on the Eastern Front') / Waiter ('Oh! Forevermore!') / Front End of Horse / Quartet Member ('Nellie')
62

George White's Scandals
Hick (uncredited)
50

West Point of the Air
Soldier at Kelly's Wreckage
60

The Airmail Mystery
Holly
0

King for a Night
Soda Jerk
62

Blake of Scotland Yard
Henchman (uncredited)
0

Scratch-As-Catch-Can
54

Northern Frontier
Stuttering Cook
0

Curtain at Eight
Backstage Detective [extra]
59

Party Wire
Paul - Railroad Telegrapher (uncredited)
80

The Life of Vergie Winters
Roscoe (uncredited)
52

Man Of Action
Cashier Summers
0

Bride of Frankenstein
Peasant (uncredited)
75

Strange People
The Radio Repairman
50

A House Divided
Musician (uncredited)
48

Parachute Jumper
Counterman at Jewel Diner (uncredited)
58

Speed Madness
Joe
0

Law Beyond the Range
Abner
0

Sensation Hunters
Stuttering Waiter
20

When Love Is Young
Uncle Hugo
0

Joe and Ethel Turp Call on the President
Jim
20

The Shooting of Dan McGrew
Narrator
0

Women Won't Tell
Man in Junkyard
40

The Poor Rich
Dr. Johnson the Coroner (uncredited)
0

Alias The Deacon
Cashier at Cunningham's Rink
0

The Invisible Man
Bicycle Owner (uncredited)
75

Afraid to Talk
Protester Sign Carrier (uncredited)
60

Murder in the Private Car
Switchman (uncredited)
52

Cornered
Court Bailiff (uncredited)
60

This Woman Is Mine
Captain Jonathan Thorne
40

The Phantom of the Air
'Skid' (uncredited)
60

Golden Harvest
Farmhand at Wedding (uncredited)
50

Fugitive Lovers
2nd Bus Driver (uncredited)
60

She Couldn't Take It
Peddler
45

Whom the Gods Destroy
Clifford
55

Texas Cyclone
Sheriff Lew Collins
42

Goldie Gets Along
Stuttering Waiter
40

One Hysterical Night
Paul Revere
50

Biography of a Bachelor Girl
Reporter on Ship (uncredited)
63

Shootout at Big Sag
'Preacher' Hawker
0

Death on the Diamond
Hot Dog Vendor (uncredited)
70

Little Accident
Milkman (uncredited)
0

Saturday's Millions
Reporter
50

Neck and Neck
Hector
0

Good Dame
Elmer Spicer
55

Bogart: The Untold Story
Self (archive footage)
0

His Lucky Day
Road House Thug (uncredited)
0

The All-American
News Commentator at Game (uncredited)
50

The Last Performance
Clown (uncredited)
62

The Long, Long Trail
Skinny Rawlins
40

Armored Attack!
Karp
62
Brick-a-Brac
Lem
0

The Last Will and Testament of Tom Smith
George, Mailman
100

Sea of Lost Ships
C.P.O 'Chief' O'Malley
0

Riptide
Chauffeur (uncredited)
62

Half a Sinner
Radio Announcer
0

Great Expectations
Prisoner on Ship
62

The Silver Screen: Color Me Lavender
Self (archive footage)
49

The Perfect Tribute
Stone Cutter (uncredited)
0
Lucky Dog
Drunk #2
0

La Classe américaine
'Stumpy' (archive footage)
75

Smoke In The Wind
H. P. Kingman
60

The Way to the Gold
Uncle George Williams
0

Wild and Woolly
Gramp 'Hercules' Flynn
0

Sailor Beware!
Stuttering Thief
0

Beloved
Stuttering Boarder
0

Man on a Bus
Saul
40

Many a Slip
Minor Role (uncredited)
0

The Big Cage
Ticket Taker
60
A Fighting Finish
Student
0

The Brush Roper
Grandpa Atkins
0

Webs of Steel
0

The Day They Hanged Kid Curry
Silky O'Sullivan
0

Whom the Gods Destroy
Clifford
55

Project XX: End of the Trail
Self - Narrator
0

The Fourth Horseman
Toothless Town Drunk
0

The Western: A Lost TV Special
Self
0

Cheating Cheaters
Ship's Telegrapher (uncredited)
0

Hot Heels
Pool Hall Habitant (uncredited)
0

The Shannons of Broadway
Hez
0
Watch Your Wife
0

Uncertain Lady
Gas Station Attendant (uncredited)
0
Paradise Valley
Farmer Hiram
0
Flying High
Kidnapper
0