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Štvrtok ( Hungarian: Vágcsütörtök ) is a village and municipality in Trenčín District in the Trenčín Region of north-western Slovakia.
In historical records, the village was first mentioned in 1477.
The municipality lies at an elevation of 202 metres and covers an area of 4.084 km². It has a population of about 368 people.
'Štvrtok' is the Slovak word for Thursday. 'Csütörtök' is the Hungarian word for Thursday.