Movies:
* The Chronicles of Riddick (2004) - as Lord Marshal (credited as Duncan Regan)
* The 13th Warrior (1999) - as Buliwyf
* The Librarian: Quest for the Spear (2004) - as The Guardian
* The Scorpion King (2002) - as The High Priest
* The Phantom (1996) - as The Pirate
* Barbarian Queen (1985) - as Conan
* Hercules (1997) - as Achilles (TV Movie)
* The Lost World: Jurassic Park (1997) - as Hunter
Television:
* The Flash (2014-2017) - as The Top (recurring)
* The Tomorrow People (2013-2014) - as John "The Machine" Lydecker (recurring)
* Supernatural (2008-2015) - as Azazel (recurring)
* The Adventures of Sinbad (2012) - as The Oracle (recurring)
* Stargate SG-1 (2002-2007) - as Anubis (recurring)
* Smallville (2002-2003) - as Dr. David (recurring)
* Andromeda (2000-2005) - as Tyr Anasazi (recurring)
* Hercules: The Legendary Journeys (1995-1999) - as Ares (recurring)
* Xena: Warrior Princess (1995-2001) - as Ares (recurring)
Other:
* He has also voiced characters in video games such as The Chronicles of Riddick: Escape from Butcher Bay, The Elder Scrolls IV: Oblivion and Command & Conquer 3: Tiberium Wars.
Duncan Regehr's impressive career spans over three decades, with a focus on action, fantasy, and sci-fi genres. He often portrays strong, imposing characters, and his distinctive features and imposing stature have made him a recognizable face in these genres.