Thomas Charles Horne is an American politician, attorney, businessman, and activist who has served as the Arizona Superintendent of Public Instruction since 2023 and previously from 2003 to 2011. A member of the Republican Party, he was Attorney General of Arizona from 2011 to 2015. Horne ran for reelection as Attorney General but lost to Mark Brnovich in the 2014 Republican primary.

The Arizona Superintendent of Public Instruction is an elected state executive position in the Arizona state government. The superintendent oversees the state of Arizona's public school system and directs the state's Department of Education.