The Youth Risk Behavior Survey (YRBS) is an epidemiologic surveillance system that was established by the U.S. Centers for Disease Control and Prevention (CDC) to help monitor the prevalence of behaviors that not only influence youth health but also put youth at risk for the most significant health and social problems that can occur during adolescence and adulthood. The 2023 Montana YRBS was completed by 4,467 students in 50 public high schools during the spring of 2023. The school response rate was 100%; the student response rate was 85%; and the overall response rate was 85%. The results represent all students in grades 9-12 in Montana. The 2023 survey instrument consisted of 97 questions that assessed six priority health-risk behaviors resulting in the most significant morbidity, mortality, and social problems among youth. These behaviors include behaviors that result in unintentional injuries and violence, tobacco use, alcohol and other drug use, sexual behaviors that contribute to unintended pregnancy and sexually transmitted diseases (STDs), including HIV infection, unhealthy dietary behaviors, and physical inactivity. Survey results are presented in the following parts: (1) Introduction; (2) Survey Methods; (3) Frequency Distributions; (4) Point of Interest (POI) Graphs -- Gender, Grade Level, and Race; and (5) Trend Analysis Tables (2009-2023). [The cosponsors of the YRBS are: the Montana Department of Public Health and Human Services, the Montana Board of Crime Control, the Montana Department of Transportation -- State Highway Traffic Safety Section, and the Montana Department of Justice Special Services Bureau.]