Norris grew up in Newcastle (New South Wales) and in 1999 moved to Canberra to train at the Australian Institute of Sport. At the Pan Pacific Championships in 1999 in Sydney Norris was nominated for the first time for the Australian national team. A year later at the Olympic Games in the same city, he was not in the final of the 400 m medley. About 200 m butterfly, he was considered an outsider to the victory in the final but Norris finally risked everything and attacked the competition from the start. After 100 meters, he led the field yet. In the end he finished third and won the bronze medal as a complete surprise.
At the World Championships 2001 he won the bronze medal over 200 m medley. In the World Swimming Championship 2003 in Barcelona, he reached the final, only about 200 m butterfly and finished seventh. In the Short Course World Championships in Moscow in 2002 Norris won the silver medal over 200 m butterfly.
At the 2002 Commonwealth Games in Manchester, he won three gold medals, more than 200 m butterfly and 200 m and 400 m medley.
Although he was able to qualify for the 2004 Olympic Games, reached there but no final and was in each case about 11 200 m butterfly and 400 m medley, as well as 27 200 m medley.
In 2005, Norris stated that he take a break of one year and wanted to return to his hometown of Newcastle.
He competed at the Trials for the 2007 World Championships in Melbourne, but could not qualify for this.
Norris is the owner of Justin Norris Swim Academy.
- Club: Hunter
- Size: 1.86 meters
- Weight: 82 kg
- Coach: Eric Arnold