The OSMFLL was founded in 1979 after the Canadian Men's National Team captured the World Championships in 1978. The OLA figured that the Canadian players from Ontario needed a place to continue playing the game of field lacrosse. As a result, the original 4 teams (Peterborough, Brampton, Toronto, and Niagara) were formed.
Over the past 43 years, the league has witnessed some of the game's biggest names step onto the field. John Grant Sr, Stan Cockerton, John Tavares, Troy Cordingley, Dan Dawson, Shawn Williams, Gavin Prout, Colin Doyle, Matt Vinc, Dhane Smith, and many more!