Mastery Charter High School is a network of charter schools in Philadelphia, Pennsylvania. The schools are operated by Mastery Charter Schools, a non-profit organization that was founded in 2001. The schools serve students in grades K-12 and focus on providing a high-quality education to students in underserved communities. The schools have a strong track record of academic success, with high graduation rates and college acceptance rates. The schools also offer a variety of extracurricular activities, including sports, music, and theater programs.