Loučeň is a market town in Nymburk District in the Central Bohemian Region of the Czech Republic.

Loučeň consists of four municipal parts (in brackets population according to the 2021 census):[2] The name is derived from the personal name Loučen (in old Czech written as Lúčen; probably a variant of the name Lukáš), meaning "Loučen's (court)".

At the beginning of the 16th century, the village was a property of the Křinecký of Ronov family.

Their properties were confiscated after the Battle of White Mountain and Loučeň was acquired by the Waldstein family in 1622.

[7] Next to the castle a chapel was built, later rebuilt into the Church of the Assumption of the Virgin Mary.