Lamar High School may refer to:
- Lamar High School (Arkansas) in Lamar, Arkansas
- Lamar High School (Colorado) in Lamar, Colorado
- Lamar High School (Missouri) in Lamar, Missouri
- Lamar High School (South Carolina) in Lamar, South Carolina
- Lamar High School (Arlington, Texas) in Arlington, Texas
- Lamar High School (Houston, Texas) in Houston, Texas
Lamar High School might also reference:
- Lamar Consolidated High School in Rosenberg, Texas
- Lamar School, Meridian, Mississippi
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