The Casino faction (in German Casino-Fraktion or simply Casino) was a moderate liberal faction within the Frankfurt Parliament formed on June 25, 1848. Like most of the factions in the parliament, its name was a reference to the usual meeting place of its members in Frankfurt am Main. Casino was the largest and most influential faction at Paulskirche. Its members were for the most part national liberals.
Casino was a faction of moderate left-wingers or liberals, or right-centrists. Its members were overwhelmingly drawn from the intelligentsia of Prussia and the rest of Northern Germany, and the group's political positions were closer to those of the right wing in the Prussian assembly than to the center-right there, whose positions corresponded to those of center-left factions at Frankfurt.
With approximately 130 members, it was the largest faction. Members of the group and their publications had played major roles in preparing for and organizing the meeting of the parliament, for example in publicity in the Deutsche Zeitung, a liberal newspaper that came to be the organ of the faction, and participation in the Heppenheim Meeting, the Heidelberg Assembly, and the Vorparlament, the preliminary assembly that met in the Paulskirche from March 31 to April 3, 1848. They also had a decisive influence on the work of the parliament, especially the Frankfurt Constitution that it produced. The majority of the Casino members joined with the Westendhall faction to form the coalition of Erbkaiserliche (hereditary imperialists) that met in the concert hall of the Gasthof zum Weidenbusch and pushed through the specification of constitutional monarchy as the preferred political form of the sought-after national state. Casino also influenced the eventual adoption of a more restricted franchise than advocated by the republican groups. Members included a large number of prominent politicians: Heinrich von Gagern and Eduard von Simson, both of whom served as President of the assembly, Friedrich Daniel Bassermann, chairman of the committee that wrote the constitution, and other liberals and right-wing liberals such as Hans Adolf Erdmann von Auerswald, Hermann von Beckerath, Friedrich Christoph Dahlmann, Johann Gustav Droysen, Georg Gottfried Gervinus, Friedrich von Raumer, August Hergenhahn, Felix Lichnowsky, Karl Mathy, Gustav von Mevissen, Alexander von Soiron, Georg Waitz, and Carl Theodor Welcker.