This article details the qualifying phase for triathlon at the 2020 Summer Olympics (postponed to 2021 due to the COVID-19 pandemic). The competition at these Games will comprise a total of 110 athletes coming from their respective NOCs; each has been allowed to enter a maximum of three. All athletes must undergo a qualifying process to earn a spot for the Games through the Continental Qualification Events, the World Qualification Event, and then the Olympic Qualification List that began on May 11, 2018, and then concludes two years later on the same date.