USS Keosauqua was a proposed United States Navy screw sloop-of-war or steam frigate that was cancelled in 1866 without being completed.

Keosauqua was a wooden-hulled bark-rigged[1] (or ship-rigged[2]) Contoocook-class screw sloop-of-war[1] or steam frigate[2] with a single funnel slated to be built for the Union Navy late in the American Civil War.

She was listed in the 1864 Naval Register as "building;" her hull was projected but never completed.

Because of the collapse of the Confederate States of America in 1865, plans for her construction were cancelled in 1866.

This article about a specific ship or boat of the United States Armed Forces is a stub.