阿尔戈纳克（Algonac）位于美国密歇根州东南部，是圣克莱尔县的县治。

根据2000年美国人口普查，共有4,613人，其中白人占97.36%。

Algonac is a city in St. Clair County of the U.S. state of Michigan. The population was 4,110 at the 2010 census.

Algonac is located at the southern end of the St. Clair River, just before it splits into a large delta region known as the St. Clair Flats. (Coordinates 42°36′N 82°34′W / 42.6°N 82.56°W / 42.6; -82.56) The St. Clair River drains Lake Huron into Lake St. Clair and is part of the Great Lakes Waterway.