thumb|Köchel's arms as [[Ritter, 1842.]]
Ludwig Alois Friedrich Ritter von Köchel (; 14 January 1800 – 3 June 1877) was an Austrian musicologist, writer, composer, botanist, and publisher. He is best known for cataloguing the works of Mozart and originating the 'KV-numbers' by which they are known (KV for Köchel-Verzeichnis).