Movies:
* The Princess Bride (1987) as "The Sicilian"
* Star Trek: The Next Generation (1994) as "Klingon Officer" in the episode "Redemption Part II"
* The Lost World: Jurassic Park (1997) as "Technician"
* The Mummy (1999) as "The Mummy"
* The Mummy Returns (2001) as "The Mummy"
* Pirates of the Caribbean: The Curse of the Black Pearl (2003) as "Captain Teague"
* The Chronicles of Narnia: The Lion, the Witch and the Wardrobe (2005) as "The White Stag" (voice)
* Pirates of the Caribbean: Dead Man's Chest (2006) as "Captain Teague"
* Pirates of the Caribbean: At World's End (2007) as "Captain Teague"
Television:
* The Adventures of Brisco County, Jr. (1993-1994) as "The Sheriff"
* Highlander: The Series (1992-1998) as "Marcus"
* Babylon 5 (1994-1998) as "President William Edgars"
* Star Trek: Voyager (1995-2001) as "Klingon General" in the episode "Blood Fever"
* The X-Files (1993-2002) as "Victor Klemper" in the episode "Bad Blood"
* Charmed (1998-2006) as "The Source of All Evil"
* Supernatural (2005-2020) as "Azazel"
* Lost (2004-2010) as "The Man in Black" (voice)
* Once Upon a Time (2011-2018) as "The Sorcerer"
* Game of Thrones (2011-2019) as "The Night King"
Other:
* He has also appeared in numerous stage plays, including "The Lion King" and "Hamlet."
It's important to note that this is not an exhaustive list, and Manwaring has contributed to numerous other film and television projects, often in uncredited or smaller roles. He has been a versatile and recognizable face in the entertainment industry for many years.