| 1964 | Taggart | Cal Dodge | |
| 1967 | Too Many Thieves | Felix | |
| 1967 | The Violent Ones | Lucas Barnes | |
| 1969 | Heaven with a Gun | Coke Beck | |
| 1969 | Young Billy Young | Jesse Boone | |
| 1969 | The Good Guys and the Bad Guys | Waco | |
| 1970 | The McMasters | White Feather | |
| 1970 | Macho Callahan | David Mountford | |
| 1971 | Maybe I’ll Come Home in the Spring | Flack | |
| 1972 | Boxcar Bertha | ‘Big’ Bill Shelly | |
| 1973 | The Long Goodbye | Dave / Socrates – Marlowe’s Cellmate | Uncredited |
| 1973 | Mean Streets | Drunk | |
| 1975 | Death Race 2000 | Frankenstein | |
| 1975 | You and Me | Zeto | Also director |
| 1976 | Cannonball | Coy ‘Cannonball’ Buckman | |
| 1976 | Bound for Glory | Woody Guthrie | |
| 1977 | The Serpent’s Egg | Abel Rosenberg | |
| 1977 | Thunder and Lightning | Harley Thomas | |
| 1978 | Deathsport | Kaz Oshay | |
| 1978 | Circle of Iron | The Blind Man / Monkeyman / Death / Changsha | |
| 1978 | Gray Lady Down | Capt. Gates | |
| 1979 | Fast Charlie… the Moonbeam Rider | Charlie Swattle | |
| 1980 | The Long Riders | Cole Younger | |
| 1980 | Cloud Dancer | Brad Randolph | |
| 1982 | Q | Detective Shepard | aka Serpent & The Winged Serpent |
| 1982 | Trick Or Treats | Richard | |
| 1982 | Safari 3000 | Eddie Mills | |
| 1983 | Lone Wolf McQuade | Rawley Wilkes | |
| 1983 | Americana | American Soldier | Also director |
| 1984 | The Warrior and the Sorceress | Kain | |
| 1984 | Downstream | Bryant | |
| 1986 | P.O.W. The Escape | Col. James Cooper | aka Behind the Enemy Lines |
| 1986 | Armed Response | Jim Roth | |
| 1987 | Wheels of Terror | Col Von Weisshagen | aka The Misfit Brigade |
| 1988 | Tropical Snow | Oskar | |
| 1988 | I Saw What You Did | Stephen | |
| 1988 | Run for Your Life | Major Charles Forsythe | |
| 1989 | Night Children | Max | |
| 1989 | Sonny Boy | Pearl | |
| 1989 | Crime Zone | Jason | |
| 1989 | Future Force | John Tucker | |
| 1989 | Crime of Crimes | Captain | |
| 1989 | Wizards of the Lost Kingdom II | Dark One | |
| 1990 | Sundown: The Vampire in Retreat | Jozek Mardulak / Count Dracula | |
| 1990 | Future Zone | John Tucker | |
| 1990 | Bird on a Wire | Sorenson | |
| 1991 | Project Eliminator | Ron Morrell | |
| 1991 | Karate Cop | Dad | |
| 1991 | Martial Law | Dalton Rhodes | |
| 1992 | Double Trouble | Mr. C | |
| 1992 | Evil Toons | Gideon Fisk | |
| 1992 | Roadside Prophets | Othello | |
| 1992 | Waxwork II: Lost in Time | The Beggar | |
| 1992 | Night Rhythms | Vincent | |
| 1997 | The Good Life | | Never released[1] |
| 1998 | Children of the Corn V: Fields of Terror | Luke Enright | |
| 1998 | An American Tail: The Treasure of Manhattan Island | Chief Wulisso (voice) | |
| 1998 | The New Swiss Family Robinson | Sheldon Blake | |
| 1999 | American Reel | James Lee Springer | |
| 1999 | Natural Selection | Louis Dehoven[2] | |
| 2000 | Down ‘n Dirty | Gil Garner | |
| 2002 | Balto II: Wolf Quest | Nava the Wolf Shaman (voice) | |
| 2003 | Kill Bill: Volume 1 | Bill | |
| 2004 | Kill Bill: Volume 2 | Bill | |
| 2004 | Hair High | Mr. Snerz (voice) | |
| 2004 | Dead & Breakfast | Mr. Wise | |
| 2005 | Brothers in Arms | Driscoll | |
| 2005 | Miracle at Sage Creek | Ike | |
| 2006 | The Last Sect | Van Helsing | |
| 2007 | Homo Erectus | Mookoo | |
| 2007 | Epic Movie | The Curator | |
| 2007 | Fall Down Dead | Wade | |
| 2007 | Camille | Cowboy Bob | |
| 2007 | How to Rob a Bank | Nick | |
| 2007 | Fuego | Lobo | |
| 2007 | Max Havoc: Curse of the Dragon | Grand Master | |
| 2008 | Big Stan | The Master | |
| 2008 | Richard III | Buckingham | |
| 2008 | Hell Ride | The Deuce | |
| 2008 | Last Hour | Detective Mike Stone | |
| 2008 | Death Race | Frankenstein (voice) | |
| 2008 | Archie’s Final Project (My Suicide) | Vargas | |
| 2008 | Kandisha | The American | |
| 2008 | The Golden Boys | Captain Zeb | |
| 2009 | Absolute Evil | Raf McCane | |
| 2009 | Crank: High Voltage | Poon Dong | |
| 2009 | Road of No Return | Mr. Hover | |
| 2009 | The Rain | Clive Jonis | |
| 2009 | Bad Cop | Detective Humes | |
| 2009 | All Hell Broke Loose | Ian McHenry | |
| 2010 | True Legend | Anton | |
| 2010 | Autumn | Phillip | |
| 2010 | Money to Burn | Klau | |
| 2010 | Detention | Principal Hoskins | |
| 2011 | Stretch | Monteiro | |
| 2012 | Eldorado | The Spirit Guide | |
| 2012 | Night of the Templar (UK title: Knights Templar) | Shopkeeper |