Algonac (/ˈɔːlɡəˌnæk/ AWL-gə-nack) is a city in St. Clair County of the U.S. state of Michigan.

Incorporated as a village in 1867 and again as a city in 1967, Algonac is located at the southern end of the St. Clair River and contains a long boardwalk and riverfront park.

The city is also notable for the founding and headquarters of the now-defunct Chris-Craft Boats company.

In 1863, the small community was described as containing "a church, two or three saw-mills, a grist-mill, woollen factory, and about 700 inhabitants".

The economy was also based in lumbering, shipping, and trades associated with maritime activities on the Great Lakes.

[citation needed] Algonac was the birthplace of Emily Helen Butterfield, an artist and the first woman to be licensed as an architect in Michigan.

It was also the home of Gar Wood, the first great speed boat racer.

[citation needed] Algonac is home to two museums dedicated to its history.

[8] Algonac is situated on the largest delta in the Great Lakes, at the mouth of the St. Clair River.

[10][11] The city is located in the Blue Water Area, a sub-region of the Thumb.

[citation needed] As of the census[13] of 2010, there were 4,110 people, 1,756 households, and 1,082 families living in the city.