Freudenberg Castle, Medieval castle ruins in Freudenberg, Germany.

Freudenberg Castle was a hilltop castle at 300 m above sea level, built by the Counts of Nassau above the Weibetal, probably from 1345, together with a settlement. Of the complex only a remnant of the castle tower survives, now serving as the bell tower of the Protestant parish church standing on the site.

The counts of Nassau built the castle above the Weibetal from 1345, together with a settlement, to protect their territory; it was first mentioned in 1389. A fire badly damaged castle and town in 1540, and a second fire destroyed both completely in 1666. The castle fell into ruin, and in 1828 the last remains were demolished except for part of the castle tower.

The site reflects how military defense and rural living coexisted, with evidence of both fortification walls and domestic structures side by side. Visitors can see how people balanced protection with everyday life in one place.

The castle site is now occupied by the Evangelical parish church of Freudenberg, which stands on the hill about 300 m above sea level above the Weibetal valley. The former castle keep serves as the church's bell tower, so the surviving structure is seen from the churchyard rather than as a separate ruin.

The castle's surviving tower has served as the bell tower of the Protestant parish church since 1601, and was also used as a prison. The last remains were demolished in 1828, leaving only part of the castle tower standing.