Nicky Katt (May 11, 1970 – April 8, 2025) was an American actor. He was best known for his role as Harry Senate on the television show Boston Public and for his roles as unsympathetic villains. He also appeared in films including Insomnia, The Limey, SubUrbia, and Sin City, and was a semi-regular collaborator of Richard Linklater, Steven Soderbergh, and Christopher Nolan.