**Mark Arnold** (New York, May 23, 1957) is an American actor active in film and television since the 1980s. He gained recognition for his role as Mick McAllister, the athletic rival, in the cult film *Teen Wolf* (1985), alongside Michael J. Fox.

Another iconic performance is that of the "Blood God" in the action-horror film *Blade* (1998), where his character undergoes a spectacular transformation. Arnold is often cast in supporting roles, portraying authoritative figures, antagonists, businessmen, or characters with an aura of ambiguity or veiled threat. His career includes numerous appearances in popular television series, solidifying his presence as a recognizable face in the American film and television landscape.