The Quezon Institute is a hospital in Quezon City, Metro Manila, Philippines. The hospital is operated and managed by Philippine Tuberculosis Society, Inc. (PTSI), which also owns the property where the hospital stands. PTSI is a non-stock, nonprofit organization, with Quezon Institute as its biggest unit. PTSI was incorporated on February 29, 1960, and registered with the Securities and Exchange Commission on March 11, 1960.