The Trenčín Castle is a castle above the town of Trenčín in western Slovakia. Within the precincts of the lower castle can be found the water well, also known as the "well of love". Which according to legend was dug by a Turkish prince called Omar, who had great love for the beautiful Fatima, whom he had to redeem by digging a well in the rock. In fact the well was dug by a garrison in the 16th century, it took them 40 years and is approximately 80 m deep.

The castle houses exhibitions of the Trenčín Museum, documenting the history of the region and of the castle – exhibitions of historic furniture, weapons, pictures and other artifacts as well as a castle gallery, archaeological collections and findings. The castle is protected as a National Cultural Monument of Slovakia. In 2006, it attracted about 100,000 visitors.

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