John Dunn is an American costume designer. He is the costume designer for Boardwalk Empire. He has worked on the first, second, third and fourth seasons. He worked with Boardwalk Empire Executive Producer Martin Scorcese on his films New York Stories (1989) and Casino (1995). He has been active since 1985 and has also worked on the films Ghost Dog: The Way of the Samurai (1999), Pineapple Express (2008), and Broken Flowers (2005) and the series Bored to Death and Mad Men.