Movies:
* The Lost Boys (1987) - David
* Night of the Living Dead (1990) - Tom
* The Crow (1994) - Eric Draven / The Crow
* The Stand (1994) - Larry Underwood
* Carriers (2009) - Dr. Hank
* The Haunting in Connecticut (2009) - Peter Campbell
* The House of Usher (2017) - Roderick Usher
* Hellraiser: Judgement (2018) - The Cenobite / The Director
* The Haunting of Hill House (2018) - William Hill
Television:
* The Twilight Zone (1985-1989) - Multiple episodes
* Murder, She Wrote (1984-1996) - Multiple episodes
* Tales from the Darkside (1983-1988) - Multiple episodes
* The X-Files (1993-2002) - Episode "The Pine Bluff Variant"
* The Outer Limits (1995-2002) - Multiple episodes
* The Adventures of Brisco County Jr. (1993-1994) - Multiple episodes
* Walker, Texas Ranger (1993-2001) - Multiple episodes
* Charmed (1998-2006) - Multiple episodes
* Supernatural (2005-2020) - Multiple episodes
* The Walking Dead (2010-2022) - Multiple episodes
* Ash vs Evil Dead (2015-2018) - Multiple episodes
* The Purge (2018) - Multiple episodes
* Swamp Thing (2019) - Multiple episodes
This is just a small sample of his impressive body of work. He has also appeared in numerous other films and television shows, both in major and minor roles.
You can find a more comprehensive list of Dale Midkiff's projects on websites like IMDb and Wikipedia.