Sydden
Sydden is a German place name:
- Sydden , 1938 to 1945: Sidden , Oletzko / Treuburg district, East Prussia, since 1945: Żydy (Kowale Oleckie) , village in the Powiat Olecki, Warmian-Masurian Voivodeship, Poland
- Sydden , historical name of Sieden , Lyck district, East Prussia, now: Mazurowo , village in the powiat Ełcki, Warmian-Masurian Voivodeship, Poland