John Paul Cusack (born June 28, 1966) is an American film actor and screenwriter. He won the 1990 Most Promising Actor CFCA Award for Say Anything..., the 1998 Favorite Supporting Actor Blockbuster Entertainment Award for Con Air, and the 2000 Commitment to Chicago Award.

Cusack was born in Evanston, Illinois, to an Irish American Catholic family. His father, Dick Cusack (1925—2003), and siblings Ann, Joan, Bill, and Susie have also been actors; his father was also a documentary filmmaker, owned a film production company, and was a friend of activist Philip Berrigan. Cusack's mother, Nancy, is a former mathematics teacher and political activist. Cusack spent a year at New York University before dropping out, saying that he had "too much fire in his belly".

Cusack gained fame in the mid-1980s after appearing in teen movies such as Better Off Dead, The Sure Thing, One Crazy Summer, and Sixteen Candles. Cusack made a cameo in the 1988 music video for "Trip At The Brain" by Suicidal Tendencies. His biggest success in that genre is arguably his starring role as Lloyd Dobler in Cameron Crowe's Say Anything. His roles broadened in the late 1980s and early 1990s with more serious-minded fare such as the political satire True Colors and the film noir thriller The Grifters.