Lewis-Palmer High School (LPHS) is a public high school in Monument, Colorado. It is one of only two high schools in the Lewis-Palmer School District 38, the other being Palmer Ridge High School.

The school refused to give its 2006 valedictorian her diploma after she mentioned Jesus Christ in her commencement speech. Corder pursued legal action against the school district. The court ruled against Corder by declaring that the graduation was a school-sponsored event and therefore the school was under the obligation to uphold the constitutional separation between church and state. The court also ruled that the school's policy for graduation speeches was too vague, and thus unconstitutional due to the "chilling effect" that is created by overly broad rules.

In 2015, Kathy Thirkell won the Colorado Teachers of the Year award.

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (June 2022)

• Bobby Burling, professional MLS player, attended Lewis-Palmer High School
• Billy Cook, MLB baseball player
• Pat Garrity, basketball player who played ten years in the NBA
• Kim Lyons, personal trainer, appeared on The Biggest Loser
• Josh Scott (basketball), professional basketball player and former University of Colorado basketball star.
• Jennifer Sipes, actress and model, born in Monument, attended Lewis-Palmer High School
• Derek Theler, actor and model, attended Lewis-Palmer High School

• Official website