Robert Hepler Lowe (born March 17, 1964) is an American actor. He became famous after appearing in popular 1980s movies such as The Outsiders and St. Elmo's Fire, which included other members of the Brat Pack. Lowe is also known for his role as Sam Seaborn on The West Wing and as Senator Robert McCallister on Brothers & Sisters. He is deaf in his right ear.

Born in Charlottesville, Virginia, Rob Lowe's family moved to moved Dayton, Ohio, when he was a child. He began modeling as a young boy and broke into acting in his teens. He spent the 1980s as a member of the "Brat Pack", a group of young, powerful and reckless actors and actresses that included Emilio Estevez, Charlie Sheen (I) and Judd Nelson, among others. In 1988 Lowe was involved in a scandal centering around a sexually explicit videotape which involved a minor, for which he did 20 hours of community service in Dayton. He subsequently sought help for his problems with drugs and alcohol and has re-emerged in the 1990s as a clean and sober husband and father.