Dlžín (Hungarian: Delzsény) is a village and municipality in Prievidza District in the Trenčín Region of western Slovakia.
In historical records the village was first mentioned in 1272.
The municipality lies at an altitude of 396 metres and covers an area of 6.653 km². It has a population of about 187 people.
The records for genealogical research are available at the state archive "Statny Archiv in Nitra, Slovakia"
- Roman Catholic church records (births/marriages/deaths): 1790-1909 (parish B)
Coordinates: 48°49′N 18°31′E / 48.817°N 18.517°E