Johannes Georg Andreas Versmann (7. Januar 1820 in Hamburg-Sankt Pauli - 28. Juli 1899 in Hamburg) was a German lawyer and politician. He was the first president of the new Bürgerschaft of Hamburg in 1859 and dominated the politics of the hanseatic state as first or second mayor between 1887 and 1899.
Versmann was educated in the classical institutions of the city, Christianeum, where he established a lifelong friendship with the classical scholar Theodor Mommsen, and Johanneum until 1840. He studied law in Göttingen and Heidelberg until 1844 and settled as lawyer in Hamburg in the same year. Versmann came in contact with the ideas of liberalism during his studies and stayed with them throughout his life.
The lawyer was elected as a liberal member of the Hamburger Konstituante in 1848 but the restoration, supported and enforced by Prussian troops during the First Schleswig War, led to the removal of this body 1850.
The next political engagement was the membership of the first Bürgerschaft 1859. The liberal politician became president of the parliament and stayed in this office until 1861, when he was elected as one of the 24 lifelong members of the governing Senate of Hamburg (senate). Versmann became second mayor for the first time in 1887 and moved from this office to the office of first mayor and back to the second one several times until his death in 1899.
The liberal managed against the resistance of the Chancellor, Otto von Bismarck, to integrate the city in the customs territory of the German Empire in 1888 while maintaining an additional status as a Freeport.
| Preceded by none |
President of the Hamburg Parliament 1859–1861 |
Succeeded by Isaac Wolffson |