The first modern republic in Germany, the Republic of Mainz, is declared by Andreas Joseph Hofmann.

A republic, based on the Latin phrase res publica, is a state in which political power rests with the public (people), typically through their representatives—in contrast to a monarchy. Although a republic is most often a single sovereign state, subnational state entities that have governments that are republican in nature may be referred to as republics.

The Republic of Mainz was the first democratic state in the current German territory and was centered in Mainz. A product of the French Revolutionary Wars, it lasted from March to July 1793.

Andreas Joseph Hofmann was a German philosopher and revolutionary active in the Republic of Mainz. As Chairman of the Rhenish-German National Convention, the earliest parliament in Germany based on the principle of popular sovereignty, he proclaimed the first republican state in Germany, the Rhenish-German Free State, on 18 March 1793. A strong supporter of the French Revolution, he argued for an accession of all German territory west of the Rhine to France and served in the administration of the department Mont-Tonnerre under the French Directory and the French Consulate.