Walhalla-orden was a secret society founded in the early part of 1783 in the Sveaborg (Finnish: Suomenlinna) fortress outside Helsinki, Finland by Johan Anders Jägerhorn along with Gustaf Adolf Reuterholm. It is thought to have been instrumental in setting in motion forces that eventually caused Finnish independence.
It began as an offshoot of an obscure Swedish quasi-masonic secret society called La Constance, created to bolster loyalty to the Swedish Constitution of 1772. However, the Swedish counterpart withered quickly, while the Valhalla society took root in the Suomenlinna (Swedish: Sveaborg) fortress. In addition to the originating lodge in Sweden, they had a lodge known as The Cabin of the Holy Axel based in Turku.
Walhalla-orden was not unique to its period in Sveaborg; quite the contrary, besides a masonic lodge and Walhalla-orden, there were a number of similar societies including a British-inspired secret society of kirvesmiehet called Saint Charles' Cabin and another unconnected society called Brothers of February the Seventeenth. On the frivolous side, there was also a secret society called the Hypotenuse Society, which was primarily oriented around marathon drinking. Every shot of punch was registered as a working in the meeting minutes.
The Walhalla-orden originally was preceded by a lodge taking the name of an early ancestor of Jägerhorn, namely Rutger Ingesson, who according to legends inspired by the Song of Roland was a crusader knight in the troops of Erik the Holy. In fact there was a brief time during which St. Erik's lodge was the Finnish locus of activities.