Siegel is a ghost town in Douglas Township in Bremer County, Iowa, United States.

Primarily settled by Germans, Siegel was named by Frederick Schultz, Jr., the first postmaster of the Siegel post office.

The settlement was likely named after Union General Franz Sigel who recruited hundreds of German-American soldiers for the Union Army during the American Civil War.

In fact, many Iowans served under General Sigel first in Missouri at the Battle of Wilson's Creek and later in General U.S. Grant's Army of the Potomac.

The post office at Siegel was established on June 26, 1889 but was closed on September 15, 1900.