David Costabile is an American actor. He is best known for his television work, having appeared in supporting roles in several television series such as Billions, Breaking Bad and Better Call Saul, Damages, Flight of the Conchords, Suits, and The Wire, as well as the film The Dirt. He has also acted on film and in Broadway theatre.

Billions is an American drama television series created by Brian Koppelman, David Levien, and Andrew Ross Sorkin. The series premiered on January 17, 2016, on Showtime and its seventh and final season premiered on August 13, 2023.