Napp Pharmaceuticals Limited is a private pharmaceutical company in Cambridge, United Kingdom that was founded in 1923 and bought by the Sackler family in 1966. Headquartered together with the related Napp Research Centre in the Cambridge Science Park since the 1980s, it is a sister company of Purdue Pharma and Mundipharma, all of which are owned by the descendants of Mortimer and Raymond Sackler.