William Katt
- When We Get There
2026 Bob
- Pursuit
2022 Taye Biggs
- Overrun
2021 Detective Ed Dobbs
- The Christmas High Note
2020 Dennis
- The 2nd
2020 Senator Bob Jeffers
- The Other Side of the Wind
2018 Man in Bathroom Stall
- The Man from Earth: Holocene
2017 Art
- Subterranea
2015 Mockenrue
- Crusty Demons 18: Twenty Years of Fear
2015 Narrator
- Supergirl
2015 Minister
- The Unwanted
2014 Troy
- The Secret Lives of Dorks
2013 Mr. Gibson
- Paranormal Movie
2013 Houseguest Bill
- Sparks
2013 Matanza
- .357
2013 Smalls
- Sweetwater
2012 Dean Taylor
- Earthling
2011 Ryan Donnelly
- The Encore of Tony Duran
2011 Art Smith
- Mirrors 2
2010 Jack Matheson
- Pure Country 2: The Gift
2010 Winter
- Super
2010 Sgt. Fitzgibbon
- Deadland
2009 Shiv
- Beautiful Loser
2009 Father Hume
- Big Game
2008 Dave
- Bone Eater
2008 Dr. Boombas
- Batman: The Brave and the Bold
2008 Hawkman (voice)
- AVH: Alien vs. Hunter
2007 Lee
- The Man from Earth
2007 Art
- Gamers
2006 Reese's Boss
- Heroes
2006 Jim McCann
- River's End
2005 Director
- Mystery Woman: Game Time
2005 Donald Fiske
- Numb3rs
2005 Sven Regal
- House
2004 Walter
- Descendant
2003 Screenplay
- NCIS
2003 Doctor
- Snake Island
2002 Malcolm Page
- Gentle Ben
2002 Gittis Malone
- Determination of Death
2001 John Logan
- Circuit
2001 Gino
- Justice League
2001 Green Guardsman (voice)
- The Clean and Narrow
2000 Director
- Son of the Beach
2000
- Andromeda
2000 Eddie Aldrich
- Jawbreaker
1999 Mr. Purr
- Twin Falls Idaho
1999 Surgeon
- Catch Me If You Can
1998 Jean Benoit
- Hyacinth
1998 Andy Gillis
- Mother Teresa: In the Name of God's Poor
1997 Harry Harper
- Rough Riders
1997 Edward Marshall
- The Hunger
1997 James
- Daddy's Girl
1996 Don Mitchell
- Rattled
1996 Paul Donohue
- Romantic Undertaking
1996 Richard Tennant
- Devil's Food
1996 Andrew Burns
- 7th Heaven
1996 Will Grayson
- Cyborg 3: The Recycler
1995 Decaf
- Problem Child 3
1995 Ben Healy
- Piranha
1995 Paul Grogan
- Americanski Blues
1995 Dr. Dell Davis
- Cybill
1995
- JAG
1995 James Merrick
- Stranger by Night
1994 Troy Rooney
- The Paperboy
1994 Brian
- Tollbooth
1994 Waggy
- Models Inc.
1994
- Viper
1994 Arno Krafft
- Burke's Law
1994 Brian Cobham
- Distant Cousins
1993 Richard Sullivan
- Walker, Texas Ranger
1993 Keith Portman
- Diagnosis: Murder
1993 Roland Spear
- Animaniacs
1993 Dr. Roma (voice)
- House IV
1992 Roger Cobb
- Double X: The Name of the Game
1992 Michael Cooper
- Batman: The Animated Series
1992 Zowie (voice)
- Last Call
1991 Paul Avery
- Good Sports
1991 Nick Calder
- Naked Obsession
1990 Franklyn Carlysle
- Wedding Band
1990 Marshall Roman
- Swimsuit
1989 Brian Rutledge
- Top of the Hill
1989
- White Ghost
1988 Steve Shepard
- Perry Mason: The Case of the Lady in the Lake
1988 Paul Drake, Jr.
- Perry Mason: The Case of the Avenging Ace
1988 Paul Drake Jr.
- Perry Mason: The Case of the Scandalous Scoundrel
1987 Paul Drake Jr.
- Perry Mason: The Case of the Sinister Spirit
1987 Paul Drake Jr.
- Perry Mason: The Case of the Lost Love
1987 Paul Drake Jr.
- Perry Mason: The Case of the Murdered Madam
1987 Paul Drake Jr.
- Perry Mason: The Case of the Notorious Nun
1986 Paul Drake Jr.
- Perry Mason: The Case of the Shooting Star
1986 Paul Drake, Jr.
- House
1985 Roger Cobb
- Perry Mason Returns
1985 Paul Drake Jr.
- Baby: Secret of the Lost Legend
1985 George Loomis
- The New Alfred Hitchcock Presents
1985 Dr. Burke
- Perry Mason Returns
1985 Paul Drake
- Thumbelina
1984 The Flower Prince
- Murder, She Wrote
1984 Derek Hartman
- The Rainmaker
1982 Jimmy Curry
- Faerie Tale Theatre
1982 The Flower Prince
- Pippin
1981 Pippin
- The Greatest American Hero
1981 Ralph Hinkley
- Butch and Sundance: The Early Days
1979 Sundance Kid
- Big Wednesday
1978 Jack Barlow
- First Love
1977 Elgin Smith
- Carrie
1976 Tommy Ross
- Can Ellen Be Saved?
1974 Bob
- Police Woman
1974 Martin Wadsworth
- Kojak
1973 Carey Nysrom
- The Daughters of Joshua Cabe
1972 Billy Jack
- M*A*S*H
1972 P.F.C.
- The Rookies
1972
- Kung Fu
1972 Andy
- Emergency!
1972 Wally Lytton
- The Trackers
1971 Davey Paxton
- The Failing of Raymond
1971 Harold (uncredited)
- The Late Liz
1971 Peter Addams (as Bill Katt)
- Night Chase
1970 Marine Private
- Ironside
1967 Jimmy
- Gunsmoke
1955 Lonnie Weeks
