Rugby Ontario operates two senior men’s leagues, the Marshall Premiership and the Marshall Championship.
The Marshall Premiership is the province’s top division of men’s club rugby, while the Marshall Championship represents the province’s second flight. The Marshall Premiership is made up of the top eight clubs in Ontario (outside of the EORU), while the Marshall Championship division serves as Ontario’s second division. Each club in the two Marshall divisions will field both a 1st and 2nd XV for the duration of the season.
At the end of the season, the last place team in both the Marshall Premiership East and West divisions will be relegated to the Marshall Championship, while the first place team in both the Marshall Championship East and West divisions will earn promotion to the Marshall Premiership.
The last place team from each of the Marshall Championship divisions will play in the Intermediate Cup. On the West side, the last place team will play the top team out of the Niagara Rugby Union, while the lat place team out of the East will play the top team out of the Toronto Rugby Union. Each series will be a home-and-home and will be based on aggregate score.