Slo-Pitch Ontario Association ("SPO") was formed in 1982 in an effort to create more awareness of the sport of slo-pitch and to better communicate with its participants throughout Ontario. Our volunteer based, not-for-profit Association has worked extensively over the years to develop many programs and services to assist players, coaches, league executives, umpires and convenors/directors with their local programs. Our mission, in part, is to institute, regulate, foster and improve the game of slo-pitch and to protect and promote the mutual interests of all of our members.

In 1992, SPO became a member of Softball Ontario and affiliated with Softball Canada, the officially recognized slo-pitch/softball organizations. SPO has one of the largest provincial memberships in Canada. Slo-pitch softball is one of the fastest growing adult team sports in North America. Over 2.5 million Canadians playing this grassroots game every season.