Luxemburg-Casco High School (known informally as L-C) is a public high school located in Luxemburg, Wisconsin, United States.

It serves the greater Luxemburg-Casco area, and was founded in 1968 as a result of a merger between the school districts of Luxemburg and Casco.

[2] L-C's athletic teams are known as the Spartans, and compete in the North Eastern Conference.

The Spartans have won twenty-three WIAA state championships, tied with Wisconsin Rapids' Lincoln High School for eighteenth most in WIAA history.

[4] Enrollment at Luxemburg–Casco High School, 2000–2019In 1964, the Lake to Lake dairy coop held its annual meeting at Luxemburg High School.