|Tokyo 2020 Olympic Games||—||—||—|
At the 2022 Commonwealth Games, Bellio placed 5th in the 800-m freestyle, 7th in the 200-m freestyle and 9th in the 400-m freestyle.
- At the 2022 FINA World Championships in Budapest, Bellio finished 17th in the 800-m freestyle and 19th in the 1,500-m freestyle. She was a member of the mixed 5-km open water relay that finished 11th and she finished 34th in the 10-km open water race.
- At the 2022 Bell Canadian Swimming Trials, Bellio won gold in the 800-m freestyle. Bellio also captured silver in both the 400-m and 1500-m freestyle. Her performances qualified her for both the 2022 FINA World Championships and the 2022 Commonwealth Games.
- Katrina Bellio made her Olympic debut at the Tokyo 2020 Games competing in the first-ever women’s 1,500-m freestyle race. She lowered her personal best by more than five seconds and briefly held the Olympic record. She finished 21st in the event.
- At the Tokyo 2020 Olympic Trials, Bellio won gold in the 1,500-m freestyle and captured silver in the 800-m freestyle. Her performance in the 1,500-m freestyle qualified her for her first Olympic Games at the age of 16.
- At the 2019 FINA World Junior Championships in Budapest, Bellio was a member of the 4×200-m freestyle relay that brought home bronze. Individually, Bellio finished 8th in the 200-m freestyle, 14th in the 1,500-m freestyle and 15th in the 800-m freestyle.
- At the 2019 Canadian Swimming Championships, Bellio won gold in the 400-m, 800-m, 1500-m freestyle and the 400-m individual medley.
- At the 2019 Canadian Swimming Trials, Bellio finished fourth in the 800-m and 1500-m freestyle. Bellio also finished seventh in the 400-m freestyle and the 400-m individual medley. She achieved personal best times in all her events.
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