Dolný Lopašov (Hungarian: Alsólopassó) is a village and municipality in Piešťany District in the Trnava Region of western Slovakia.

The current mayor of Dolný Lopašov is Mário Beblavý, who won the election held on November 10, 2018 as an independent candidate.

The municipality lies at an altitude of 207 metres and covers an area of 22.934 km².

The records for genealogical research are available at the state archive "Statny Archiv in Bratislava, Slovakia" Media related to Dolný Lopašov at Wikimedia Commons

This Trnava Region geography article is a stub.