Lauwerzijl (Dutch pronunciation: [ˌlʌuərˈzɛil]; Gronings: Lauwerziel or 't Sieltje) is a village in the municipality of Westerkwartier in the province of Groningen in the Netherlands.

A connecting canal called the Munnekezijlsterried [nl] flows along Lauwerzijl.

The name Lauwerzijl indicates that the village originated near a lock in the Lauwers.

This lock was built in 1754 when the Munnekezijlsterried was moved and was demolished sometime around 1878 when the Polder Wieringa [nl] and Nieuwe Ruigezandsterpolder [nl] were diked in with the dike between Nittershoek and Zoutkamp.

Five of these farms are located on the Stadsweg, the same road on which Lauwerzijl originated.