Dennis Franz Schlachta, known professionally as Dennis Franz, is an American retired actor best known for his role as NYPD Detective Andy Sipowicz in the ABC television series NYPD Blue (1993–2005), a role that earned him a Golden Globe Award, three Screen Actors Guild Awards and four Primetime Emmy Awards. He also portrayed two different characters on the similar NBC series Hill Street Blues and its short-lived spinoff, Beverly Hills Buntz (1987–1988).

Andrew Sipowicz Sr. is a fictional character on the popular ABC television series NYPD Blue. Andy began as the secondary focus of a more ensemble-like show, but by the middle of Season 6 he is the clear protagonist of the show and receives the main storyline in every episode. Dennis Franz portrayed the character for its entire run.