Roswell High School (RHS) is a public high school in Roswell, Georgia, United States established in 1838.[1] It serves most of the city of Roswell west of Georgia State Route 400 and the city of Mountain Park, as well as small portions of Alpharetta and Milton. Roswell High School neighbors both Fellowship Christian School and Blessed Trinity Catholic High School. It is the oldest of Fulton County's schools in the northern portion of the county, opening before Milton High School (1921), and Chattahoochee High School (1991). Roswell is currently on its third campus and sixth schoolhouse, which opened in 1990. The current building is the oldest in-use high school building in north Fulton.

Roswell is a member of the Georgia High School Association (GHSA) and Region 4-AAAAAAA for athletic competition, as of the 2016–2017 academic year. The school's mascot is the Hornet, and the school colors are green and white. Roswell offers 16 different sports, comprising 23 varsity level teams. Eight of the Roswell Hornet teams have won state championships, totaling 20 overall. The most championships won by a single team is seven, accomplished by the girls' gymnastics program.

Roswell High School first opened in 1838 as The Academy and then The Roswell School, and is the oldest high school in Fulton County north of the Chattahoochee River. Like the city of Roswell, the school bears the name of Roswell King. King founded the cotton mill that would eventually be the city's economic backbone for much of its early history. The immediate predecessor to Roswell High School was the Roswell Public School on Mimosa Boulevard, which housed grades 1–10 and opened in the 1892 after the Georgia General Assembly passed Act No. 51 on December 20, 1892, allowing the city to elect a school board and levy taxes for support of the school. Students from outside the city limits were required to pay tuition. In 1896, the city council and mayor were authorized by the state to issue $5,000 in bonds to build a new school building.

In 1914, the existing school was torn down and two new structures were built. Since schools were segregated at that time, a two-story brick building was constructed on Mimosa Boulevard to house the white students in grades 1 through 10, and a one-room wooden building was built on Pleasant Hill Avenue for black students in grades 1 through 7. The Pleasant Hill facility also served as a meeting place for a local lodge and the Pleasant Hill Baptist Church until the church built its own facility across the street in 1922. Grade 11 was added in the 1920s to the Mimosa Boulevard school. Black students who progressed past grade 7 could then attend Washington High School in Atlanta.

During the Great Depression, the city of Roswell was annexed into Fulton County from Cobb County as part of its 1932 combination with Milton County and Campbell County. Roswell students in grades ten and eleven were then sent to Milton High School in Alpharetta or North Fulton High School in Atlanta to finish their secondary education (which ended upon completion of grade 11). In 1949, the Mimosa Boulevard building was demolished, and a new school was built on the existing site to allow the 10th and 11th grades to return to Roswell and students were divided within the school between elementary and high school grades. G.W. Adams was the first principal after the division and oversaw the addition of more rooms to the school over the next few years. During this growth, the Baptist, Presbyterian and Methodist churches also located on Mimosa Boulevard were used to house auxiliary classrooms. Also in 1949–1950, the high school began participating in athletics with a varsity basketball team and other senior high school extracurricular activities. In 1950, Roswell High School added grade 12 as part of the statewide standard for high schools, and played its first varsity football season. The first graduating 12th grade class was in the spring of 1951. Prior to that year, students graduated in 10th and 11th grades.

Construction began nearby on Alpharetta Highway near the present-day Roswell City Hall on a new campus. That facility opened in the fall of 1954 and allowed the high school (grades 8–12) to physically separate from the elementary school (grades 1–7). Roswell High's second campus was designed by the architecture firm Stevens & Wilkinson, which innovated school designs and used a "finger plan" to improve functionality of the school. It had a capacity of 400 students and had facilities for industrial arts, a shop, music halls, science labs, an art room, an indoor gymnasium, athletic fields, a football stadium, and a track. The School started getting crowded in the early 70s. This forced Fulton county to establish Crestwood High School to relieve it. The School also relieved similar overcrowding at North Springs Charter School of Arts and Sciences. The primary school remained in the Mimosa Boulevard building as Roswell Elementary. As of 2007, the brick elementary building is part of an expanded structure still owned by the Fulton County School System, and it housed the Crossroads Second Chance North Alternative School until 2013 and still serves as the Teaching Museum North. Roswell High remained at the Alpharetta Highway campus until the fall of 1990 when the current campus on King Road was opened.

The current campus is the third that Roswell High School has occupied. It opened in the fall of 1990 on King Road, just off of Highway 92, with an enrollment of nearly 2,000 students. It is the oldest high school building in North Fulton. The new campus was expanded with a football stadium and softball field added in 1994 and an auditorium in 1995, paid for by the RHS Foundation. The campus includes science, computer, video, and cosmetology labs; baseball and softball fields, a stadium for football and soccer, a lacrosse field, an additional practice field, a dome style gymnasium, a cross country trail, and lighted tennis courts for athletics.

In 2008 the Roswell gymnasium was named one of the top high school gyms in the nation. Cited were the domed rotunda, the hanging four sided scoreboard, and locker room facilities.