The 2015 Ironman 70.3 World Championship was a triathlon competition that was held in Zell am See-Kaprun, Austria on August 30, 2015.

The championship was organized by the World Triathlon Corporation (WTC) and was the culmination of the Ironman 70.3 series of events that occurred from August 3, 2014 through July 12, 2015.

Former champions Jodie Swallow and Meredith Kessler both exited the race early.

Swallow pulled out after the swim after suffering a bike crash the previous day.

In previous years some 70.3 events also served as qualifiers for the full Ironman World Championships in Hawaii.

This was to accommodate for the increased number of qualifying slots created from the newly added full Ironman events.

*Ironman 70.3 Lake Tahoe was canceled due to smoke from the King Fire.