The Midwestern Ontario Senior Baseball League is a mens (19+) baseball league based in Midwestern Ontario. Our history dates back to 2005, first as the Thames Valley Senior Baseball League. Since 2017, the league has run under the MOSBL name. Member teams include Junior (22u) and Senior aged clubs as per Baseball Ontario regulations.
MOSBL member teams can be found in 10 different towns and 7 counties throughout Mid-Western Ontario. Ranging from London in the south to Port Elgin in the North, and as far east as Kitchener.