Augusta Harmonie Verein, also known as the American Legion Post 262 and Grand Army of the Republic Hall, is a historic clubhouse located at Augusta, St. Charles County, Missouri, United States. It was built in 1869, and is a -story, frame building with board and batten siding. It measures approximately 35 feet wide by 95 feet deep and has a weatherboarded addition built about 1970. Also on the property is a contributing octagonal bandstand constructed about 1890.
It was added to the National Register of Historic Places in 1995.