Tanbridge House School, formerly Horsham High School for Girls, is a coeducational secondary school in Horsham, West Sussex, England.
In November 2012, and again in June 2024, the school achieved and maintained an 'Outstanding' Ofsted rating in all four key areas of inspection.
The school theatre production is held every summer at the Capitol Theatre in Horsham, and has included West Side Story (2008) ' (2009) Les Misérables (2010), Evita (2011), The Phantom of the Opera (2012), Miss Saigon (2013), Jekyll and Hyde (2017), Made in Dagenham (2018), High School Musical (2022) and Sister Act (2023).
In 1971, pupils at the school, then Horsham High School for Girls, put on the play Antigone by Jean Anouilh jointly with Christ's Hospital school.