The Helvetische Gesellschaft / Société Helvétique, or Helvetic Society as it is known in English, was a patriotic society and the first Swiss reform society. It was founded by Swiss philosopher Isaak Iselin, poet Solomon Gessner and some 20 others on 15 May 1762, and was dissolved with the formation of the Helvetic Republic in 1798. It was revived again from 1819 on until 1849. The latter should not be confused with the contemporary Helvetic Society for the Natural Sciences, established in 1815.
The Helvetic Society was the first patriotic society in Switzerland aimed at all Swiss people. It was inspired by Franz Urs Balthasar's Patriotische Träume eines Eidgenossen von einem Mittel, die veraltete Eidgenosenschaft wieder zu verjüngen, an essay from 1758 which was distributed in manuscript form and was discussed by Joseph Anton Felix von Balthasar (son of the author), Iselin, Gessner and Hans Caspar Hirzel.
After two years of discussion, and a change of scope from an historical society to a more socially directed one, the Society first met with 9 members in 1761, and was eventually formed on 15 May 1762 in Schinznach-Dorf, with statutes by Hirzel, with 25 initial members. While it had an open membership structure and advocated religious harmony, very few Catholics joined, and the members were predominantly German-speaking. The society tried to be more than just a philosophical debate club like most other similar European societies, and also organised social activities, and a yearly autumn meeting from 1763 on, first in Schitznach, and from 1780 on in Olten, and finally in Aarau. New statutes were approved in 1766, focusing on the inclusiveness of the society towards all Swiss from all cantons. The aims of the Society included a democratic reform of the Swiss constitution, and education for all, influenced by the ideas of Jean-Jacques Rousseau as expressed in Emile: or, On Education. The pedagogic reformer Johann Heinrich Pestalozzi was an early member of the Society. He was one of the contributors for the Society's magazine Der Erinnerer, established in 1765, but it was soon suppressed for being too radical and critical of the authorities.