Lyons Township High School (often referred to as LTHS or simply LT) is a public high school in Western Springs, Illinois (South Campus), and La Grange, Illinois (North Campus).

Lyons Township is a coeducational high school and serves grades 9–12 for Lyons Township High School District 204. Students from the communities of La Grange, Western Springs, Burr Ridge, La Grange Park, Countryside, Indian Head Park, Hodgkins, and parts of Brookfield, Willow Springs, and McCook attend Lyons Township. Lyons Township High School is the 8th-largest public high school in Illinois and the 45th-largest public high school in the United States.

Lyons Township High School was established on April 4, 1888, and opened on September 4, 1888.^{[citation needed]} LTHS's first principal was Professor H.W. Thurston. The original building is now a part of North Campus in La Grange. On September 9, 1889, the school was officially dedicated. In June of 1891, Lyons Township held its first commencement with seven students, all women.^{[citation needed]}

On October 10, 1905, The LT Board of Education purchased just over three acres adjacent to the school. This land was used for athletic purposes and became known as Emmond Field. The original gate into Emmond Field still stands outside of the Vaughan Building at North Campus.^{[citation needed]}

In 1915, the first school band was formed. On Oct 30, 1926, the first homecoming dance was held, and featured a banquet and dance.^{[citation needed]}

The 1926 addition to the school added roughly 35 new classrooms, an auditorium with seating for 1,800, a community room with a small stage, and a gymnasium created for girls' athletics.^{[citation needed]}

In March 1928, the Bell Tower was up and running for the first time.^{[citation needed]} The face of the large bell is adorned with the words:

“As call so fly the irrevocable hours, Utile as air or strong as fate, Make your lives of sand or granite; awful powers; Men as man choose, they either give or take.”