Summertree is a 1971 American drama film directed by Anthony Newley, about a young man who drops out of university, falls in love with an older married woman, and contemplates dodging the draft to avoid serving in the Vietnam War. The screenplay was written by Edward Hume and Stephen Yafa, based on the 1967 play of the same name by Ron Cowen.

In 1970, 20-year-old Jerry (Michael Douglas) visits his parents Herb (Jack Warden) and Ruth (Barbara Bel Geddes) to tell them he is considering dropping out of university to find himself. His parents are worried, not only because they have wasted expensive tuition on Jerry, but also because the Vietnam War is raging and by dropping out, Jerry will lose his student draft deferral.

Inspired by a television advertisement, Jerry becomes a Big Brother to a black child named Marvis (Kirk Calloway). When Marvis is slightly injured in a fall, they visit a hospital where Jerry meets a nurse named Vanetta (Brenda Vaccaro). Jerry and Vanetta soon fall in love, despite Vanetta being older than Jerry, and they begin living together. Jerry accidentally discovers an autographed photo of Vanetta declaring her love to a man named Tony (Bill Vint). Vanetta explains that Tony is her husband and they separated two years ago, although they are not divorced.

Jerry follows through on his plan to drop out of university. Confident in his self-taught guitar playing, he auditions for the conservatorium and gets a regular paying gig playing at a local coffeehouse. Herb discovers that Jerry has dropped out when he receives Jerry's draft notice in the mail. Jerry is initially not worried because he expects to be accepted to the conservatorium, which would restore his student draft deferral. Unfortunately, despite his impressive audition, the conservatorium rejects him for lack of any formal musical training. He investigates other ways to evade the draft, to no avail.

Jerry's streak of bad luck continues when Marvis's older brother is killed in Vietnam and Marvis takes his anger out on Jerry, ending their relationship. Next, Tony, having just returned from Vietnam wearing his Marine uniform, comes to Vanetta's apartment while she is out, and tells Jerry that Vanetta promised to wait for him. When Vanetta comes home, Jerry leaves to let her and Tony deal with their personal issues. Jerry buys an old Ford Falcon and plans to flee to Canada to evade the draft. Vanetta, torn between Tony and Jerry, decides not to accompany Jerry to Canada.

The night before Jerry is supposed to report for his induction physical, he visits his parents to tell them he is going to Canada and to say goodbye. After a family argument, Herb appears to accept his decision, but urges him to have his car inspected for safety at the local gas station the next day, and even buys him a set of new tires. While Jerry looks at some road maps, he overhears Herb attempting to bribe the gas station mechanic to disable Jerry's car so it cannot run for a few days, in order to prevent Jerry's departure. Jerry bursts into tears and drives his car out of the station into another car being towed by a tow truck.

In the final scene, Herb and Ruth go to bed as their bedroom television broadcasts news footage of action in Vietnam. As they close their eyes, the television shows a close-up of a dying Jerry being carried away by fellow soldiers.

Michael Douglas had been cast in the original play on Broadway but was fired from his role and replaced with David Birney. His father Kirk Douglas bought the rights to the play and filmed it with his son in the lead he lost.