An American film and television actor. He is a character actor with numerous brief appearances on television and films, usually noted for his unusual appearance. He has played many bit parts in movies directed by his brother, actor-turned-director Ron Howard. He is also the uncle of actress Bryce Dallas Howard.
Description above from the Wikipedia article Clint Howard, licensed under CC-BY-SA, full list of contributors on Wikipedia.
My Dog Skip
As Aunt Maggie
Halloween
As Doctor Koplenson
The Wraith
As Rughead
Austin Powers: International Man of Mystery
As Radar Operator
Cocoon
As John Dexter
The Waterboy
As Paco
Senior Skip Day
As Lionel Huffer
Super Capers
As Mugger
House of the Dead
As Salish
100 Women
As Mr. Willens
Far Cry
As Scientist
EDtv
As Ken
Chow Bella
Blackwoods
As Greg / Motel Clerk
Frost/Nixon
As Lloyd Davis
Addams Family Reunion
As Dogcatcher
Beethoven's 5th
As Owen Tuttle
How the Grinch Stole Christmas
As Whobris
Fist of the North Star
As Stalin
Rock 'n' Roll High School
As Eaglebauer
The Jungle Book
As Junior (voice)
BloodRayne: The Third Reich
As Doctor Mangler
Ticks
As Jarvis Tanner
Gung Ho
As Paul
Public Enemy #2
As Ray Tidrow
Playing with Beethoven
As Theater Janitor
Holyman Undercover
As Roy Sr.
Night Shift
As Jefferey
Cheyenne Warrior
As Otto Nielsen
Ice Cream Man
As Ice Cream Man / Gregory Tudor
Eat My Dust
As George Poole Jr.
Carnosaur
As 'Slim' Friar
Evilspeak
As Stanley Coopersmith
Big Bad Wolf
As Fulton Chaney
Blubberella
As Doctor Mangler
End of the Line
As Les Sullivan
Alabama Moon
As Constable Sanders
Ping!
As Stu
Silent Night, Deadly Night 5: The Toy Maker
As Ricky
A Christmas Too Many
As Todd
The Old Way
As Eustice
Church Ball
As Gene Jensen
Not Like Us
As Wede
Winnie the Pooh and the Honey Tree
As Roo (voice)
Silent Night Deadly Night 4: Initiation
As Ricky
Disturbed
As Brian
River's End
As Mr. Powell
Call Me Crazy: A Five Film
As Harold
Assault on Wall Street
As Chuck
Sparks
As Gordon Eldridge
Get Crazy
As Usher
Splash
As Wedding Guest
The Many Adventures of Winnie the Pooh
As Roo (Honey Tree and Blustery Day) (voice)
Arthurs Quest
As Mr. Whitney
Baby Face Nelson
As Asst. Bank Manager
Raising Genius
As Mr. Goss
Planet Ibsen
Last Call
As George
The Red Pony
As Jody Tiflin
Sand Castles
As Todd Carlson
The Rocketeer
As Mark
House of Dead: Director's Cut
As Salish
The Onania Club
Gentle Giant
As Mark Wedloe
The Courtship of Eddie's Father
As Child Party Guest (uncredited)
My Big Fat Independent Movie
As The Mechanic
Santa with Muscles
As Hinkley
Foreign Exchange
As Long Larry
Rattled
As Andy Parsons
The Church
As Alexander James / The Spirit
Guys and Girls Can't Be Friends
As Gus
Huff
As Karl
Play the Game
As Dick Mitchell
The Powder Puff Principle
As Principal Skelter
Cotton Candy
As Corky MacPherson
B.O.R.N.
As Jerry
Cards, Cads, Guns, Gore, and Death...
As Card Player #3
Apollo 13
As Sy Liebergot - EECOM White
Heart of America
As Artie Lynne
Grand-Daddy Day Care
As Judge Littles
Cinderella Man
As Referee
Parenthood
As Lou
Huckleberry Finn
As Arch
The Missing
As Sheriff Purdy
The Funhouse Massacre
As Taxidermist
Body Chemistry II: Voice of a Stranger
As Larabee
Freeway
As Ronnie
Curious George 2: Follow That Monkey!
As Farmer Dan (voice)
An Eye for an Eye
As Jo-Hi Quince
Leprechaun 2
As Tourist
Searching for Haizmann
As Franciscus Abbot
Backdraft
As Ricco, Pathologist
Body Armor
As Hutch
Fold
Terrifier 3
The Rapsittie Street Kids: Believe in Santa
As Tug (voice)
Big Guy
As Mr. Bennett
Dillinger and Capone
As Bobo
The Profane Exhibit
As Bob (segment "Basement")
Humanoids from the Deep
As Deputy
UnConventional
As Self
The Lords of Salem
As Carlo (uncredited)
Barb Wire
As Schmitz
Mad Families
As Gravy
Night at the Museum: Battle of the Smithsonian
As Air and Space Mission Control Tech #1
Night Club
As Cliff
Austin Powers in Goldmember
As Johnson
The Dilemma
As Herbert Trimpy
Twisted Love
As Gardener
Curious George
As Balloon Man (voice)
A Plumm Summer
As Binky the Clown
Solo: A Star Wars Story
As Ralakili
Street Corner Justice
As Rapist
The Dentist 2
As Mr. Toothache
I Am Stamos
As Clint Howard
Salty
As Tim Reed
The Paper
As Ray Blaisch
How to Eat Fried Worms
As Uncle Ed
Austin Powers: The Spy Who Shagged Me
As Radar Operator Peters
3 from Hell
As Mr. Baggy Britches
Little Nicky
As Nipples
Grand Theft Auto
As Ace
Clint Howard Reboots Pippi Longstocking with Milla Jovovich and Fred Willard
As Clint
Puppets
As The Puppet
Unhook the Stars
As Gus
Comedy Central Roast of William Shatner
As Balok
That Thing You Do!
As KJZZ Disk Jockey
Forced to Kill
As Drifter
The Sure Hand of God
As Clyde Trotter
F. You All: The Uwe Boll Story
As Himself
Winnie the Pooh and the Blustery Day
As Roo (voice)
Far and Away
As Flynn
The Wild Country
As Andrew Tanner
Bigfoot: The Unforgettable Encounter
As Thompson
Evasive Action
As Hector Miller
Twilight
As EMS Worker
Play the Flute
As Mr. Webber
Direct to Video: Straight to Video Horror of the 90s
As Himself
The Cat in the Hat
As Kate the Caterer
American Bigfoot
As Paul Miller
Feast of Fear
As The Messenger
To Hell and Back: The Making of 3 From Hell
As Himself
American Christmas
As Lee
Fun with Dick and Jane
As INS Agent
Deported
As Weird Carney
La Flamme Rouge
As Conrad Wilhelm
The Death of Richie
As Peanuts
I Never Promised You a Rose Garden
As Baseball Catcher
Tango & Cash
As Slinky
Harper Valley P.T.A.
As Corley
Pauly Shore Is Dead
As Pauly's Business Manager
Apple Seed
As Hughie
Star Trek: Inside the Roddenberry Vault
As Self
Balls Out
As Philip
Digital Man
As Dawkins
Michael Lives: The Making of Halloween
As Self
Speed-Dating
As Dom
Forget Paris
As Exterminator
Telling You
As Customer
Sparkle and Charm
As Arnold
Nobody Gets Out Alive
As Doctor Owen
Little White Lies
As Limo Driver
Beyond Paranormal
As Dr. Ulrich Von Strauss
London Betty
As Narrator
Lou Grant
The Andy Griffith Show
As Leon
Star Trek
As Balok
Star Trek: Enterprise
As Muk
The Rookies
The Odd Couple
As Randy Grainger
The F.B.I.
As Alan Ellwood
Heroes
As Tom Miller
Fringe
As Emmanuel Grayson
The Pretender
As Smitty
My Name Is Earl
As Creepy Rodney
Crossing Jordan
As Gil Runkis
The Streets of San Francisco
E! True Hollywood Story
Strip Mall
Happy Days
The Mod Squad
Gunsmoke
As Lonny
Night Gallery
As Herbie Bittman (segment "The Boy Who Predicted Earthquakes")
Total Recall 2070
Hunter
As Man in Restaurant
Space Rangers
As Mimmer
Laredo
As Midj
Arrested Development
As Johnny Bark
The Monroes
The Fugitive
As Johnny Stransel
The Virginian
As Tommy
Lancer
The Patty Duke Show
Judd for the Defense
Gung Ho
As Googie
Ben Casey
The Baileys of Balboa
Please Don't Eat the Daisies
The Cowboys
As Steve
Breaking Point
The Jean Arthur Show
The Outer Limits
As Dennis
Gentle Ben
As Mark Wedloe
The Fitzpatricks
As D'Annunzio
The Birthday Boys
As Various
The View
As Self - Guest
Seinfeld
As Tobias Lehigh Nagy
From the Earth to the Moon
As Paul Lucas
Late Night with Seth Meyers
As Self
Star Trek: Strange New Worlds
As Commander Buck Martinez
Married... with Children
As Mullen
Star Trek: Discovery
As Creepy Orion
The Kelly Clarkson Show
Bonanza
As Michael Thorpe
The Mike Douglas Show
As Self
Star Trek: Deep Space Nine
As Grady
Pam & Tommy
As Schmitz
Comedy Central Roasts
As Self
Love, American Style
As David Kaufman
The Last Drive-in with Joe Bob Briggs
As Self
The Danny Kaye Show
As Self