In Treatment is an American drama television series for HBO, produced and developed by Rodrigo Garcia, based on the Israeli series BeTipul (Hebrew: בטיפול), created by Hagai Levi, Ori Sivan and Nir Bergman.

The series follows a psychotherapist, Paul Weston, in his 50s, and his weekly sessions with patients, as well as those with his own therapist at the end of the week. The program, which stars Gabriel Byrne as Paul, debuted on January 28, 2008, as a five-night-a-week series. Its executive producer and principal director was Paris Barclay, who directed 35 episodes, the most of any director on the series, and the only one to direct episodes in all three seasons. The program's format, script and opening theme are based on, and are often verbatim translations of BeTipul. HBO Canada aired the program simultaneously with HBO in the U.S. Season 1 earned numerous honors, including Emmy, Golden Globe and Writers Guild awards.

The series was renewed for a second season on June 20, 2008, and production on Season 2 wrapped in early 2009. According to The New York Times, production relocated to New York City from Los Angeles at the insistence of Byrne, who otherwise threatened to resign. The move and the addition of Sunday night to the schedule were considered votes of confidence in the series by HBO executives. Season 2 premiered on April 5, 2009. The second season built on the success of the first, winning a 2009 Peabody Award. The third season premiered on October 26, 2010, for a seven-week run, with four episodes per week. The 24-episode fourth season premiered on May 23, 2021, and aired four episodes weekly, with Uzo Aduba taking over as the series lead Dr. Brooke Taylor.

In February 2022, HBO confirmed that the show would not return again.

Psychotherapist Paul Weston has a private practice where he carries out sessions with his patients in his Baltimore home. He begins to question his own abilities and motives, so he seeks help from his former mentor and therapist Gina Toll, whom he has not seen for ten years.

Gabriel Byrne portrays Paul Weston, a charming, relentless psychologist, who is seeking a peaceful existence, free of self-doubt and ambivalence. He is a graduate of Georgetown University, where he earned his undergraduate degree, Columbia University, where he earned a master's degree, and The New School, where he received his PhD (though a season one scene shows two diplomas from the University of Pennsylvania displayed near the door to Paul's office). In summer 1988, he moved to Maryland, where he worked at the Washington–Baltimore Psychoanalytic Institute and later established his private practice in Baltimore.

Dianne Wiest portrays psychotherapist Gina Toll, Paul's former mentor and clinical supervisor whom Paul avoided for nine years after an argument over reservations Gina expressed in a letter of recommendation on Paul's behalf. She acts as a sounding board for Paul's doubts about his motives and abilities.

Each episode of In Treatment focuses on one patient, including Paul, who is seeing his clinical supervisor and psychotherapist, Gina.