Aaron Burr Caswell (1807–1896) was an American frontiersman and the first white man to occupy any part of Mason County, Michigan.

In 1841, he moved his family to Barrington Station, Lake County, Illinois, where they bought a farm and lived for six years.

[2] Caswell went on a hunting and fishing trip in 1845 to Pere Marquette Township in Mason County, Michigan.

[2] He briefly returned to Illinois in 1847 to retrieve his family for relocating back to the Michigan area permanently.

[6] For many years, Caswell produced lumber and shingles from the local timber and it was shipped to Chicago for construction.