Jonathan Niven "Jon" Cryer (born April 16, 1965) is an American actor, screenwriter and film producer. He is the son of actress/singer Gretchen Cryer. He made his motion picture debut by starring in the 1984 romantic comedy No Small Affair, but gained greater fame by starring as "Duckie" in the John Hughes-scripted film Pretty in Pink. In 1998 he finished writing and producing the independent film Went to Coney Island on a Mission From God... Be Back by Five, which was well received.

Even though Cryer gained some fame by starring in these movies, he had not found television success; the shows he had starred in (The Famous Teddy Z, Partners and The Trouble with Normal) all did not last very long. In 2003 he was cast to portray Alan Harper on the CBS hit comedy series Two and a Half Men, opposite Charlie Sheen, for which Cryer won a Primetime Emmy Award in 2009. He received three earlier Emmy Award nominations for Outstanding Supporting Actor in a Comedy Series for his work on the show.

Cryer is the son of Gretchen Cryer (née Kiger), a playwright, songwriter, actress, and singer, and Donald David Cryer, an actor, singer, and producer. He has two sisters, Robin and Shelley. When he was 12 years old he decided that he wanted to become an actor. When his mother heard this she thought he should have a backup plan and joked "Plumbing is a pretty good career". Cryer attended Stagedoor Manor Performing Arts Training Center for several summers as a teenager and is a 1983 graduate of the Bronx High School of Science.