thumb|Lamar High School Cheerleaders in the 2021 Arlington Independence Day Parade
Lamar High School is a secondary school in Arlington, Texas. It is named for Mirabeau B. Lamar, the second president of the Republic of Texas, and serves grades 9 through 12 in the Arlington Independent School District.
History
Lamar opened in 1970 as Arlington Independent School District's third high school. Lamar relieved Arlington High School and Sam Houston High School. Cathy Brown of The Dallas Morning News Said that Lamar's effect on Sam Houston was "minimal" because there were very few housing units located north of Division and east of Collins. Brown said that "[t]he effect on Arlington High School was huge" since the housing in the Arlington zone north to Division had been moved to Lamar. 12th-grade students that had been zoned out of Arlington High School continued to attend Arlington High School, despite being in the Lamar zone.
- Mark M. Shelton: Texas House of Representatives District 97 (2009–2013), physician at Cook Children's Hospital
- John Rayborn: Former UTEP Quarterback, playing in Canadian Football League and Arena Football League.
- Shane Buechele: Quarterback for the Buffalo Bills
- Perry Minasian: General Manager, Los Angeles Angels, MLB
- Bobby Brown III: NFL defensive lineman, currently with the Los Angeles Rams
- Kyron Johnson: Linebacker for the Philadelphia Eagles
- Isaiah Neyor: College football player for the Texas Longhorns