The Southern Michigan League was a Minor League Baseball circuit which operated between 1906 and 1912. It was classified as a Class D league from 1906 to 1910 and as a Class C league from 1911 to 1912. After that, the league was known as the Southern Michigan Association between 1913 and 1915.
Tha Southern Michigan Association held a Class D status in 1913 and was given Class C recognition in 1914 and 1915. The Association closed up after the 1915 season.