Bill Powell-Harris was selected for the Irish equestrian eventing team at the 1972 Munich Olympic Games but did not start in the individual competition.

His selection as part of a six-rider Irish eventing squad – alongside Bill Buller, Ronnie McMahon, Patrick Connolly-Carew, Bill McLernon and Juliet Jobling-Purser – reflected the strength of Irish eventing in the early 1970s, a period in which Ireland regularly fielded competitive teams at the highest international level.

The Irish team finished 9th of 19 competing nations at Munich.