Killeen High School is a public high school located in Killeen, Texas and classified as a 6A school by the University Interscholastic League. It is one of six high schools in the Killeen Independent School District, which is located in western Bell County. During 2022–2023, Killeen High School had an enrollment of 2,076 students and a student to teacher ratio of 16.25. The school received an overall rating of "C" from the Texas Education Agency for the 2021–2022 school year.

The Killeen Kangaroos compete in the following sports:

• Baseball
• Basketball
• Bowling
• Cheerleading
• Cross Country
• Football
• Golf
• Soccer
• Softball
• Swimming and Diving
• Tennis
• Track and Field
• Volleyball
• Wrestling

• Football - 1991 (5A/D1)
• Boys Track - 1978 (4A), 1979 (4A), 1980 (4A), 1981 (5A), 1991 (5A)

• Football – 1954 (2A)
• Volleyball – 1976 (4A)
• Girls Water Polo – 1981, 1982, 1983
• Cheerleading — 2018 (6A)
• Boys Swimming – 1979

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 2024)

• Mark Adickes, former NFL player
• Brandon Bernard, murderer
• Don Hardeman, former NFL player
• Juaquin Iglesias, former NFL player
• Anthony McDowell, former NFL player
• David McMillan, former NFL player
• Gerald McNeil, former NFL player
• Pat McNeil, former NFL player
• Chris Morgan, current NFL coach
• Darrol Ray, former NFL player
• TaShawn Thomas (born 1993), basketball player in the Israeli Premier League
• Craig Watts, former NFL player and coach
• Cory Jefferson, former NBA player

• List of high schools in Texas

• Official website
• Killeen Independent School District website