Union Pier is an unincorporated community in Berrien County in the U.S. state of Michigan.

It is situated between the Lake Michigan shore and the Galien River about five miles north of the Indiana state border.

During the summer of 1914 a colony of Chicago bohemians, including the writers Sherwood Anderson and Ben Hecht, vacationed at the "Camp's Cottages" (for the owner Eli Camp) on the Union Pier beach.

The locals made the situation sufficiently uncomfortable for the vacationers that they did not return the next year.

[2] After the end of World War II, many Lithuanian immigrants began settling in Union Pier.