Hans Seydenfaden von Erfurt (Hanns Seyden Faden vo~ Erfürt) was a 15th century German fencing master. Seydenfaden means silk thread, possibly a reference to his occupation, and Erfut is a city in the German state Thuringia. Though no treatise authored by him is currently know to survive, his renown as a master was sufficient for Paulus Kal to include him in the list of members of the Society of Liechtenauer in 1470.
His name is also mentioned twice in the 1539 Hans Medel Fechtbuch, which may indicate that Hans Medel possessed a treatise by Seydenfaden that is now lost. It is even possible that the treatise on Seven Stances that Medel included was written by Seydenfaden.