Stevenson Ranch is an unincorporated community in the Santa Clarita Valley of Los Angeles County, California. Stevenson Ranch is set in the foothills of the Santa Susana Mountains and lies west of Interstate 5 and the city of Santa Clarita. Stevenson Ranch encompasses virtually 6.4 square miles (17 km). About 1,000 acres (4.0 km²) are let as parks, recreation areas, and right of entry space. A master-planned community, it was credited by the county in 1987. The population was 17,557 at the become old of the 2010 census. For statistical purposes, the Census Bureau has designated it a census-designated place (CDP).

It is home to Stevenson Ranch, Pico Canyon, and Oak Hills elementary schools (part of the Newhall School District), and Rancho Pico Junior High and West Ranch High School (part of the William S. Hart Union High School District). The Valencia Marketplace and Stevenson Ranch Shopping Center are popular shopping areas in the community. Six Flags Magic Mountain, an amusement park, is located just about three miles (4.8 km) north of Stevenson Ranch. The area backs going on to the historic oil-mining town of Mentryville, founded in 1875.

The names of many streets located in Stevenson Ranch are those of authors (e.g., Thackeray, Hemingway, Shakespeare, and Poe).

It is plus the filming location of several film and television productions, including the television show Weeds, a Showtime native series, as with ease as the feature film Pleasantville. Its master-planned natural world is at the heart of the suburban commentary of Weeds, such as the “Little Boxes” song and sprawling forward movement portrayed in the commencement of the show.