Friedrichstadt may refer to:

• Friedrichstadt, a town in Schleswig-Holstein
• Friedrichstadt (Amt), a collective municipality in Schleswig-Holstein
• Friedrichstadt (Berlin)
• Friedrichstadt (Dresden)
• Former name of the city of Jaunjelgava, Latvia

• Scythris canella
• Scythris canescens
• Scythris canispersa
• Scythris capilliverticella
• Scythris capitalis
• Scythris capnofasciae
• Scythris carboniella
• Scythris caroxylella
• Scythris catuliformis
• Scythris cederbergensis
• Scythris ceratella
• Scythris cinisella
• Scythris cirra
• Scythris clarki
• Scythris claudioculella
• Scythris clemens
• Scythris compsias
• Scythris concurrens
• Scythris conimarginella
• Scythris coniobliquella
• Scythris consimilella
• Scythris cooperi
• Scythris coriella
• Scythris corleyi
• Scythris cornuella