Canada competed at the 2017 World Championships in Athletics in London, United Kingdom, 4–13 August 2017. On July 18, 2017, a team of 48 athletes was announced to represent the country at the championships. The team was later increased to 57 athletes after the IAAF issued invites to athletes to round out fields in each event. 2015 double bronze medallist and three time medallist at the 2016 Summer Olympics Andre de Grasse withdrew from the competition after tearing his hamstring in practice before the competition.