James O’Callaghan has received awards at the following contests
- Ars Electronica Forum Wallis, Leuk (Switzerland): 2017, 2018, 2020
- Concours biennal de composition acousmatique Métamorphoses, Ohain (Belgium): 2018
- Concours international de la musique électroacoustique SIME, Lille (Nord, France): 2018
- Concurso de Composición Electroacústica Destellos, Mar del Plata (Argentina): 2016, 2018, 2019
- Exhibitronic, Strasbourg (Bas-Rhin, France): 2017
- Friends of Canadian Music Award, Canada: 2014
- Iannis Xenakis International Electroacoustic Composition Competition, Greece: 2019
- ISCM Young Composer Award: 2017
- Jeu de temps / Times Play (JTTP), Canada: 2013
- Juno Awards, Canada: 2014
- MA/IN Matera Intermedia Competition, Matera (Italy): 2018
- Musica Nova International Competition of Electroacoustic Music, Prague (Czech Republic): 2015, 2017, 2020
- Musicworks Electronic Music Composition Contest, Toronto (Ontario, Canada): 2014
- Prix CIME: 2017
- Prix Museond de la créativité en musique mixte, Montréal (Québec): 2026
- Prix Opus, Québec: 2017, 2020
- Robert Fleming Prize, Ottawa (Ontario, Canada): 2015
- SOCAN Awards, Canada: 2018
- SOCAN Foundation Awards for Young Composers, Canada: 2013, 2014