Burg Dorfelden, Medieval castle ruins in Niederdorfelden, Germany.

Burg Dorfelden is the ruin of a water castle on an artificially raised hill in Niederdorfelden, north of Hanau. The Nidder flows around the hill and feeds the circular moat that rings the whole site. Parts of the ring wall survive in the north and northwest, with traces of buildings on the inside of the north wall. A round tower remains, its lower section built of buckelquader, probably from the second half of the 12th century; the remains of a second round tower lie toppled at the foot of the hill.

Dorfelden Castle was first documented in 1234, when Reinhard III of Dorfelden and his brother Heinrich divided their inheritance; the family is recorded from 1166. Reinhard's successors took the name of Hanau, and in 1288 Ulrich I of Hanau bought the castle back after it had passed to the Falkenstein, Weinsberg and Rieneck families. In 1333 Ulrich II gave it as a fief to Duke Rudolf of Saxony, who needed a fortified stop a day's journey from Frankfurt for the journey to and from royal elections. Later it passed to the Junkerhof, served as a quarry and fell into ruin; consolidation work began in the late 20th century.

The name Dorfelden derives from Turinfelde, first recorded in 767, while the castle itself appears in documents in 1234. In 1333 Ulrich II of Hanau gave the castle as a fief to Duke Rudolf of Saxony, because the Saxon elector needed a fortified place about a day's journey from Frankfurt, where Roman-German kings were elected and later crowned. The castle later passed to the Junkerhof and was used as a quarry.

Walking paths from the northern section of the old village center of Niederdorfelden lead visitors directly to the castle site. The routes are straightforward and pass through scenic areas nearby.

The round moat fed by the Nidder encircles the whole hill, but the stream also flows around the artificially raised mound itself. The surviving round tower keeps humpback ashlars in its lower section, probably from the second half of the 12th century; the remains of a second round tower lie toppled at the foot of the hill.