The J. O. Westwood Medal is awarded every two years by the Royal Entomological Society (RES).
The criteria for the award are:[1] The best comprehensive taxonomic work on a group of insects, or, related arthropods (including terrestrial and freshwater hexapods, myriapods, arachnids and their relatives).
Open to authors from any country who demonstrate the highest standards of descriptive taxonomy in the work nominated.and the winner is chosen by a panel of senior and international RES Fellows.
[1] The award was inaugurated in 2008,[1] and is named in honour of the entomologist, John O. Westwood.
Recipients are awarded a silver gilt medal and £1000.