 | The Price for Silence (2018) as Richard Davenport |
 | Every Act of Life (2018) as Himself |
 | Pennywise: The Story of IT (2018) as Himself |
 | Time After Time (2011) |
 | Taking Woodstock (2009) as Don |
 | The Lazarus Project (2008) as Cop #2 |
 | Beyond a Reasonable Doubt: Making '12 Angry Men' (2008) as Himself |
 | Wild Hearts (2006) as Bob |
 | Annie's Point (2005) as Richard Eason |
 | Anna's Dream (2002) as Rod Morgan |
| | Beyond the Prairie, Part 2: The True Story of Laura Ingalls Wilder Continues (2002) as Charles Ingalls |
 | The Miracle of the Cards (2001) as Dr. Neal Kassell |
 | Flight of the Reindeer (2000) as Jerry McNeil |
 | Wonder Boys (2000) as Walter Gaskell |
 | The Million Dollar Kid (2000) as Ted Hunter |
 | Beyond the Prairie: The True Story of Laura Ingalls Wilder (1999) as Charles Ingalls |
 | Big and Hairy (1998) as Victor Dewlap |
 | Flood: A River's Rampage (1998) as Herb Dellenbach |
| | A Thousand Men and a Baby (1997) as Dr. Hugh Bud Keenan |
 | A Walton Easter (1997) as John-Boy Walton |
 | Riding the Rails (1997) as Narrator |
 | Timepiece (1996) as Richard Evans |
 | What Love Sees (1996) as Gordon Holly |
 | The Christmas Box (1995) as Richard Evans |
 | The Invaders (1995) as Jerry Thayer |
 | Death in Small Doses (1995) as Richard Lyon |
 | To Save the Children (1994) as David Young |
 | A Walton Thanksgiving Reunion (1993) as John-Boy Walton |
 | Linda (1993) as Paul Cowley |
 | Precious Victims (1993) as Don Weber |
 | I Can Make You Love Me (1993) as Richard Farley |
| | Lincoln (1992) |
 | Crash Landing: The Rescue of Flight 232 (1992) as Gary Brown |
 | Yes Virginia, There Is a Santa Claus (1991) as James O'Hanlan |
 | Mission of the Shark: The Saga of the U.S.S. Indianapolis (1991) as Lieutenant Steven Scott |
 | Glory! Glory! (1989) as Rev. Bobby Joe |
 | Go Toward the Light (1988) as Greg Madison |
 | Final Jeopardy (1985) as Marty Campbell |
| | AFI Life Achievement Award: A Tribute to Lillian Gish (1984) as Self |
 | Hobson's Choice (1983) as Will Mossup |
 | Living Proof: The Hank Williams, Jr. Story (1983) as Hank Williams, Jr. |
| | Johnny Belinda (1982) as William Richmond |
 | Barefoot In the Park (1982) as Paul Bratter |
 | Fifth Of July (1982) as Kenneth Talley Jr. |
 | Berlin Tunnel 21 (1981) as Sandy Mueller |
| | To Find My Son (1980) as David Benjamin |
 | Battle Beyond the Stars (1980) as Shad |
 | All Quiet on the Western Front (1979) as Paul Bäumer |
 | No Other Love (1979) as Andrew Madison |
| | Getting Married (1978) as Michael Carboni |
 | September 30, 1955 (1977) as Jimmy J. |
| | The Silence (1975) as Cadet James Pelosi |
| | The Red Badge of Courage (1974) as Pvt. Henry Fleming |
 | You'll Like My Mother (1972) as Kenny |
 | The Homecoming: A Christmas Story (1971) as John-Boy Walton |
| | Cactus in the Snow (1971) as Harley MacIntosh |
 | The Todd Killings (1971) as Billy Roy |
 | Red Sky at Morning (1971) as Joshua Arnold |
 | Last Summer (1969) as Peter |
 | Winning (1969) as Charley |
| | Give Us Barabbas! (1961) as Junge |
 | A Doll's House (1959) as Ivor (as Richard E. Thomas) |
| | The Christmas Tree (1958) as Joey |
| | Unforgiven |
 | You'll Like My Mother |
| | Living Proof: The Hank Williams, Jr. Story Executive Producer |
