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.^[2]

Tulsa's first public school opened in 1884.^[3] The Union school district was formed in 1919 when four rural community districts consolidated.^[4]

In addition to providing typical academic courses in English, mathematics and science, Union High School offers an Oklahoma social studies course as required by state law.^[5]

All Oklahoma high schools must provide a physical education course designed to provide a minimum of 150 minutes of physical education per week, unless provided an exemption by the Oklahoma State Department of Education due to undue hardship.^[5]

Union High School has State Department of Education and North Central Association accreditation.^[4]

Union's use of the "Redskins" team name has exposed it to some criticism, similar to the controversy faced by other schools using mascots referring to Native Americans. In 1999, Cherokee Nation chief Chad "Corntassel" Smith criticized the school's use of the name.^[10] In December 2002, the school received a demand from the University of Miami that it stop using a "split-U' logo which Miami claimed was unacceptably similar to the university's trademarked logo. Some Native American groups saw this as an appropriate time to renew their calls to pressure Union to abandon the Redskins name, since it appeared that the school would have to change its uniforms in any event. However, in January 2003, Union settled Miami's claim by agreeing to pay $1,000 per year for the continuing right to use the split-U logo.^[11] In November 2003 the school board voted unanimously to keep the "Redskins" name.^[12] Since that time the school had maintained its position despite continued protests and proposed legislation intended to change the name.^[13] In July 2020, following an announcement by the Washington Redskins that their ownership would review its name, the Union school board announced it would also reevaluate the district's mascot.^[14]

• Brent Albright, professional wrestler
• Taylor Armstrong, reality TV personality from The Real Housewives of Beverly Hills; originally Shana Hughes, cheerleader and 1989 graduate^[15]
• Sam Blankenship, All-American Linebacker, Harding University
• Tre Brown, football defensive back for NFL's Seattle Seahawks
• Kyle Crutchmer, former wrestler and current Bellator mixed martial artist
• Melinda Doolittle, singer, third place finalist on American Idol in 2007^[16]
• Dominique Franks, football cornerback for Atlanta Falcons, 2010–13^[17]
• Justin Fuente, former Oklahoma Sooners quarterback and former head football coach for the Virginia Tech Hokies^[18][19]
• Wesam Keesh, American actor^[20]
• Jeff Leiding, football linebacker for Indianapolis Colts, 1986–1987^[21]
• Steve Logan, NFL assistant coach, East Carolina head coach 1992–2002 and Boston College offensive coordinator 2007–2009;^[22] assistant coach at Union High, 1974–79^[23]
• Zac Mabry, actor from The Little Rascals^[24]
• Isaiah McGuire, NFL defensive end for the Cleveland Browns^[25]
• John Moreland, singer-songwriter^[26]
• Myron Noodleman, baseball clown, stage name of former Union High School math teacher and football coach Rick Hader
• Dari Nowkhah, ESPN sportscaster
• Julián Rebolledo, voice actor
• Jake Spavital, Texas State University, Head Football Coach^[27]
• Ricky Stromberg, American football player^[28]
• Les Walrond, Major League Baseball pitcher 2003–08
• Tress Way, American football player^[29]