The Ontario Junior Lacrosse League (OJLL) is considered the most competitive Junior A men's box lacrosse league in the world and the number one source for talent for the National Lacrosse League (NLL). The OJLL is sanctioned by the Ontario Lacrosse Association. It is an 12 team league wherein the top 8 go to the playoffs and battle it out for top spot in Ontario. The Ontario Champion is annually awarded the Iroquois Trophy and moves on to compete against teams from Alberta and British Columbia for the Minto Cup - the Junior A National Box Lacrosse Championship of Canada. Ontario has captured the Minto Cup fifty-six times since 1937. Since the first NLL draft in 1996, sixteen OJLL alumni have been selected first overall.
Champion moves on to the Minto Cup national championship.