Lamar High School is a comprehensive public secondary school located in Houston, Texas, United States. It is a part of the Houston Independent School District (HISD). Lamar High School, was established in 1936 in memory of Mirabeau B. Lamar (1798–1859), a leader in the Texas Revolution and the second President of the Republic of Texas. Lamar has a four-year program, serving grades 9 through 12.