Au Sable (/ɔː ˈsɑːbəl/ AW sah-bəl) is an unincorporated community and census-designated place (CDP) in Iosco County, Michigan.

Au Sable was first settled in 1848 when Curtis Emerson and James Eldridge purchased land in the area.

Au Sable was the largest community in the county and incorporated as a city in 1889.

[5] Most of the city was destroyed by forest fires in 1911, and the post office closed on December 15, 1912.

[6] The city surrendered its charter in 1931 and dissolved into an unincorporated community within Au Sable Township.

26.4% of all households were made up of individuals, and 14.1% had someone living alone who was 65 years of age or older.