After a few places allocated to championships, the bulk of places are awarded on the basis of world rankings as at 31 May 2012. After 8 NOCs have qualified 3 athletes for an event, other NOCs are limited to 2 athletes for that event.
Qualification timeline
Qualification progress
Qualification summary
References
{{DEFAULTSORT:Triathlon at the 2012 Summer Olympics - Qualification
Qualification for the 2012 Summer Olympics