Lewisville High School was originally located on Purnell Street in downtown Lewisville. LHS moved to its current location at Main Street and Valley Parkway in 1968. At that time, the school was located in farmland at the edge of Lewisville. LHS had several additions since then due to the city of Lewisville's large growth. In the 2012-2013 school year, Lewisville High School officially opened its new building immediately adjacent to the old building originally built in 1968 yet still on the same campus. The following school year, a new auditorium opened. The old building's demolition started the exactly the last day of the 2011-2012 school year. The old campus was cleared for the use of additional parking. Lewisville High School currently consists of three different campuses. Killough Lewisville High School North, "North Campus" and Harmon Lewisville High School South serve ninth and tenth graders. The LHS "Main Campus" primarily serves eleventh and twelfth graders. For extracurricular activities students are shuttled from the Killough and Harmon campuses to the Main campus. Together, their 2014 enrollment was 3,980 students, making LHS the largest high school in the district.
Aside from standard Math, English, Science, and Social Studies classes, LHS offers many Advanced Placement courses. Many electives are offered, including, but not limited to, Foreign Languages, Band, Choir, Athletics, Art, Orchestra, NJROTC, Debate, Theatre Arts, and Academic Decathlon. Technology and career elective classes are offered at the Dale Jackson Career Center and Career Center East.
Lewisville High School's Student Council has won the State Sweepstakes. The council is the student governing board of Lewisville High School.
Band
Lewisville's marching band has earned a "1" at the UIL Region Contest every year since 2000. In competitions the marching band sticks to an old-school military marching style, concentrating on marching in lines and blocks, with spartan use of thematic elements.
Orchestra
The LHS Orchestra program is designed to develop and advance orchestral string studies at the Lewisville Independent School District's first and oldest high school, and its two 9th-10th Grade Extension Campuses. In addition to performing concerts during the school year, the LHS Orchestra also participates in orchestra competitions. The LHS Orchestra is currently divided into three groups: Honors, Chamber and Sinfonia.
Theater
Lewisville High School's theater program has taken both plays and musicals to perform on the Main Stage at the Texas State Thespian Festival. In 2015, Lewisville took Carlyle Brown's "The African Company Presents: Richard III" to State in the UIL One Act Play and placed 1st for 6A.
The school's football team were state finalists in 1972, state semifinalists in 1979, and won state championships in 1993 and 1996. The 1996 Farmer football team set the championship game record for most yards gained on the ground, while the combined score of 92 in the game set a new record for most points in an 11-man title game. An earlier team achieved notability for a different reason in 1946, when members of the Fighting Farmer football team chased a bank robber until he was exhausted, allowing for his capture by an unarmed gas station attendant.s
Softball
On June 1, 2013, the Lewisville High School girls' softball team won the University Interscholastic League 5-A state championship by defeating Kingwood High School by a score of 3-2. The team finished fourth in the district's standings at the end of the regular season, prompting many analysts to label the team as an "underdog" throughout the tournament. Prior to the final state tournament in Austin, WFAA journalist Ted Madden wrote "if any team looks like it doesn't belong in Austin, it's this 13-loss team from Lewisville."
