René Paul Victor Kiparsky (born January 28, 1941) is a Finnish professor of linguistics at Stanford University. He is the son of the Russian-born linguist and Slavicist Valentin Kiparsky. Kiparsky is especially known for his contributions to phonology. These include coining the terms , and phonological opacity (including the types feeding, bleeding, counterfeeding, and counterbleeding), and creating the frameworks of Lexical Phonology and Morphology (LPM) and its successor, Stratal Optimality Theory. A noted Pāṇini scholar, he has also made fundamental contributions to historical linguistics and generative metrics, as well as working in morphosyntax, especially on his native Finnish.