Tesoro High School's theatre arts department is under the leadership of Cheryl Des Palmes. In 2004 and 2005, Tesoro High School's theatre arts department won many CAPPIES awards. In 2013, "Legally Blonde: The Musical" won for Best Musical, Best Orchestra, Best Featured Actor in a Musical, and Best Comedic Actress in a Musical, among some 30 nominations. In 2014, their production of "Seussical" won for Best Musical, Best Orchestra, and again, Best Comedic Actress in a Musical. The department participates annually in Theatre Festivals including: South Orange County Roleabout, Fullerton Junior College High School Theatre Festival, California Educational Theatre Association's festival, and the Long Beach State High School Theatre Festival.