Greenhill School is a co-educational day school in Addison, Texas, United States. The school was founded in 1950 by Bernard Fulton. The 78-acre (320,000 m2) campus is located 12 miles (19 km) north of downtown Dallas, Texas. It enrolls about 1,400 students from throughout the Dallas Metroplex. The school is the first co-educational, non-denominational pre-kindergarten through grade 12 school in Dallas and is a member of both the Independent Schools Association of the Southwest (ISAS) and the Southwest Preparatory Conference (SPC).