Sean Patrick Hayes (born June 26, 1970) is an American actor, comedian, and producer. He is best known for his role as Jack McFarland on the NBC sitcom Will & Grace, for which he won an Emmy Award, four SAG Awards, and one American Comedy Award, and earned six Golden Globe nominations. He also runs a television production company called Hazy Mills Productions, which produces shows such as Grimm, Hot in Cleveland, The Soul Man, and Hollywood Game Night.

Answer this question based on the passage: actor who plays jack in will and grace? Okie... think carefully first, then make a decision:
The important part for answering this question is: He is best known for his role as Jack McFarland on the NBC sitcom Will & Grace, for which he won an Emmy Award, four SAG Awards, and one American Comedy Award, and earned six Golden Globe nominations. So, the answer is Sean Patrick Hayes.