Peter Frederick Weller (born June 24, 1947) is an American film and stage actor, director and lecturer.

He is best known to moviegoers as the titular character of RoboCop in the first two RoboCop movies as well as Buckaroo Banzai in the cult classic The Adventures of Buckaroo Banzai Across the 8th Dimension. He received an Academy Award nomination for his direction and acting in the 1993 short Partners.

Weller was born in Stevens Point, Wisconsin, the son of Dorothy, a homemaker, and Frederick Weller, a lawyer, federal judge, and former helicopter pilot for the Army who often flew President Lyndon B. Johnson. Weller had a "middle-class Catholic" upbringing. As a result of his father's army work, Weller spent many years abroad during his childhood. His family lived in Germany for several years before eventually moving to Texas, where he attended Alamo Heights High School in San Antonio. While enrolled at North Texas State University (now the University of North Texas), he played trumpet in one of the campus bands. He graduated with a Bachelor of Arts in Theatre, and began his acting career after graduating from the American Academy of Dramatic Arts.