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). Typically, this will be a taxonomic revision or monograph. 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.^[1]

Past winners include:^[1]

• 2008 (2008): Dr Marianne Horak
• 2010 (2010): Dr Art Borkent [Wikidata]
• 2012 (2012): Dr James S. Miller [Wikidata]
• 2014 (2014): Professor Lee Herman [Wikidata]
• 2016 (2016): Dr Stanisław Adam Ślipiński & Dr Hermes Escalona [Wikidata]
• 2018 (2018): Frank H. Hennemann, Oskar V. Conle [Wikidata], Paul D. Brock [Wikidata] & Francis Seow-Choen [Wikidata]
• 2019 (2019): Dr Jason P. W. Hall [Wikidata]
• 2020 (2020): Professor Brett C. Ratcliffe [Wikidata] and Dr Ronald D. Cave [Wikidata]
• 2021 (2021): Randall T. Schuh [Wikidata] & Christiane Weirauch [Wikidata]
• 2022: David J. Clarke, Duane McKenna, Rolf Oberprieler, & Ajay Limaye