| | "Arrested Development" .... Narrator (52 episodes, 2003-2006) |
| | A Beautiful Mind (2001) (uncredited) .... Man at Gouverners Ball |
| | Osmosis Jones (2001) (voice) .... Tom Colonic |
| | How the Grinch Stole Christmas (2000) (uncredited) .... Townsperson |
| | "Frasier" .... Stephen (1 episode, 1999) |
| | Return to Mayberry (1986) (TV) .... Opie Taylor |
| | David Letterman's Holiday Film Festival (1985) (TV) .... (segment "But I'm Happy") |
| | "Happy Days" .... Richard 'Richie' Cunningham / ... (42 episodes, 1974-1984) |
| | When Your Lover Leaves (1983) (TV) (uncredited) |
| | "Saturday Night Live" .... Host (1 episode, 1982) |
| | Night Shift (1982) (uncredited) .... Annoying Sax Player/Boy Making out with Girlfriend in Front of Chuck's Apartment |
| | Fire on the Mountain (1981) (TV) .... Lee Mackie |
| | "Insight" (1 episode, 1981) |
| | Bitter Harvest (1981) (TV) .... Ned De Vries |
| | Act of Love (1980) (TV) .... Leon Cybulkowski |
| | "The Fonz and the Happy Days Gang" (1980) TV Series .... Richie Cunningham (unknown episodes) |
| | "Laverne & Shirley" .... Richie Cunningham (2 episodes, 1976-1979) |
| | More American Graffiti (1979) .... Steve Bolander |
| | Grand Theft Auto (1977) .... Sam Freeman |
| | The Shootist (1976) .... Gillom Rogers |
| | Eat My Dust (1976) .... Hoover Niebold |
| | The First Nudie Musical (1976) (uncredited) .... Auditioning actor |
| | I'm a Fool (1976) (TV) |
| | Huckleberry Finn (1975) (TV) .... Huckleberry Finn |
| | "Disneyland" .... Chris / ... (5 episodes, 1967-1975) |
| | Locusts (1974) (TV) .... Donny Fletcher |
| | The Spikes Gang (1974) .... Les Richter |
| | The Migrants (1974) (TV) .... Lyle Barlow |
| | "The Waltons" .... Seth Turner (1 episode, 1974) |
| | Happy Mother's Day, Love George (1973) .... Johnny |
| | American Graffiti (1973) (as Ronny Howard) .... Steve Bolander |
| | "M*A*S*H" .... Private Wendell Peterson (1 episode, 1973) |
| | "Bonanza" .... Ted Hoag (1 episode, 1972) |
| | "The Bold Ones: The New Doctors" .... Cory Merlino (1 episode, 1972) |
| | "Love, American Style" .... Richie Cunningham |
| | "The Smith Family" (1971) TV Series .... Bob Smith (unknown episodes, 1971-1972) |
| | The Wild Country (1970) (as Ronny Howard) .... Virgil |
| | "Lassie" .... Gary (2 episodes, 1970) |
| | Smoke (1970) (TV) (as Ronny Howard) .... Chris |
| | "Gunsmoke" .... Jamie (1 episode, 1969) |
| | "Lancer" .... Turk Caudle / ... (2 episodes, 1968-1969) |
| | "Daniel Boone" .... Luke (1 episode, 1969) |
| | "Land of the Giants" .... Jodar (1 episode, 1969) |
| | "Judd for the Defense" .... Phil Beeton (1 episode, 1969) |
| | "The F.B.I." .... Jess Orkin (1 episode, 1968) |
| | "Mayberry R.F.D." .... Opie Taylor (1 episode, 1968) |
| | "The Andy Griffith Show" .... Opie Taylor (122 episodes, 1960-1968) |
| | A Boy Called Nuthin' (1967) (TV) (as Ronny Howard) .... Richie `Nuthin'´ Caldwell |
| | "Gentle Ben" .... Jody Cutler (1 episode, 1967) |
| | "The Monroes" .... Timothy Prescott (1 episode, 1967) |
| | "I Spy" .... Alan Loden (1 episode, 1966) |
| | "Gomer Pyle, U.S.M.C." .... Opie Taylor (1 episode, 1966) |
| | "The Big Valley" .... Tommy (1 episode, 1965) |
| | Village of the Giants (1965) (as Ronny Howard) .... Genius |
| | "The Fugitive" .... Gus (1 episode, 1964) |
| | "Dr. Kildare" .... Jerry Prentice (1 episode, 1964) |
| | "The Great Adventure" .... Daniel Waterhouse (1 episode, 1964) |
| | "The Eleventh Hour" .... Barry Stewart (1 episode, 1963) |
| | The Courtship of Eddie's Father (1963) (as Ronny Howard) .... Eddie |
| | "Route 66" .... Chet (1 episode, 1962) |
| | The Music Man (1962) (as Ronny Howard) .... Winthrop Paroo |
| | "The New Breed" .... Tommy Simms (1 episode, 1962) |
| | "General Electric Theater" .... Barnaby Baxter / ... (2 episodes, 1959-1961) |
| | Door-to-Door Maniac (1961) (as Ronnie Howard) .... Bobby |
| | "Pete and Gladys" .... Tommy (1 episode, 1960) |
| | "Dennis the Menace" .... Stewart (5 episodes, 1959-1960) |
| | "The Many Loves of Dobie Gillis" .... Math Teacher's Son (1 episode, 1960) |
| | "Make Room for Daddy" .... Opie Taylor (1 episode, 1960) |
| | "The DuPont Show with June Allyson" .... Wim (1 episode, 1959) |
| | "The Twilight Zone" .... The Wilcox Boy (1 episode, 1959) |
| | "Johnny Ringo" .... Ricky Parrot (1 episode, 1959) |
| | The Journey (1959) (as Ronny Howard) .... Billy Rhinelander |
| | Frontier Woman (1956) (uncredited) .... Bit Part |