Leopoldov (before 1948 Mestečko; German: Leopold-Neustadtl; Hungarian: Lipótvár) is a town in the Trnava Region of Slovakia, near the Váh river.

The town was founded in 1664-1669 as a fortress against the Ottoman Turks on the initiative of Emperor Leopold I (hence the name).

A village called "Leopold" (German also: Leopoldstadt, Hungarian since 1873: Lipótvár) was made part of Leopoldov in 1882.

In modern Slovakia, Leopoldov is an important transfer point of railway tracks.

Leopoldov was founded on fields of old villages of Červeník (former 'Verešvár') and Šulekovo (former Beregsek).