Peter Ryom (born May 31, 1937 in Copenhagen) is a Danish musicologist. He is internationally known as the author of the Ryom-Verzeichnis, the now-standard catalog of the works of Antonio Vivaldi. The number of a composition in the Ryom Verzeichnis (Ryom catalog) is always prefaced by the abbreviation RV. (The V in RV stands for Verzeichnis, not Vivaldi.)