Union High School is the highest level of secondary education in the Union Public Schools system of Tulsa and Broken Arrow, Oklahoma, for students in 10th, 11th and 12th grades. The school, combined with Union 9th Grade Center, is the second-largest high school in the state of Oklahoma, behind only Broken Arrow High School.

Union Public Schools is a public school district located in southeast Tulsa, and northwest Broken Arrow, Oklahoma. The school district is the eighth-largest in Oklahoma. Union is notable among school districts in the area because Union does not encompass a particular city. Instead, many of its patrons believe Union is a unifying organization within the community, providing activities for its families, a sense of pride, support and identity for its patrons.