HPP may refer to:
Medicine Allopurinol, a medication Hereditary pyropoikilocytosis, a blood disorder HPP epoxidase, an enzyme Hypokalemic periodic paralysis, a muscle disease Hypophosphatasia, a bone disease Hypoxia preconditioned plasma
Other uses Hardy-Pomeau-Pazzis model, in computational fluid dynamics Harrington Park Press, an American publisher Harris Performance Products, a British motorcycle racing/parts manufacturer Hawaiian Paradise Park, a community on the island of Hawaii Head Phones President, a Japanese metal band Health Partners Plans, a health insurance network High Performance Programme, in cricket High pressure processing of food Holme Pierrepont National Watersports Centre, in England Human Proteome Project Hydroelectric power plant Hydrometallurgy Pilot Plant, in Egypt C++ Header file Headturn Preference Procedure, in statistical language acquisition Honda Power Port, a type of two-stroke power valve system Handan East railway station, China Railway telegraph code HPP Hosted Payment Page (also known as Hosted Checkout), used in ecommerce for secure checkouts. HTTP parameter pollution