The Rhein class of ironclad riverine monitors (Flußkanonenboote) were a pair of ships built by the German Imperial Navy in the aftermath of the Franco-Prussian War. The class comprised two ships, Rhein and Mosel; both were built by the AG Weser shipyard in Bremen, in 1872–1874. They were armed with a pair of bronze cannon in a revolving gun turret. The ships were intended to protect the German border with France in the event of a conflict, but had short service lives, as war did not come. They served briefly in the defenses of Coblenz, starting in 1875, before being withdraw from service. The two ships were sold for scrap, apparently in December 1884.