The Synod of Worms of May 868 was a council of the church in East Francia, convoked by King Louis the German at the request of Pope Nicholas I.
Held in the aftermath of the Photian Schism, which had divided the Greek East and Latin West, it sought to uphold Western teaching and Papal primacy.
In response to years of unrest in Moravia and the marches of Pannonia and Carantania, the synod authorized the confiscation of the rebels' private property and their excommunication.
It is probable that the synod had in mind the Byzantine missionaries Constantine and Methodius, who had been working in Moravia, but by 868 they had the support of Pope Hadrian II in Rome.
On matters of episcopal authority, the canons cite the Collectio Hispana and not the False Decretals, either because the latter were unknown in East Francia or else were not considered authoritative there.