Fildu de Jos (Hungarian: Alsófüld) is a commune located in the southern part of Sălaj County, Transylvania, Romania.

Archeological excavations have brought to the surface traces of settlements which existed prior to the Roman occupation.

The actual villages were situated along the main cross-roads between the Roman camps in the valley of the river Crișul Repede and Porolissum.

[citation needed] At the 2002 census the population counted 1,583 inhabitants of which 63.10% were Romanians, 21.22% Hungarians, 15.47% Roma, and 0.21% were of other nationalities.

The church was built in 1727 by the artist Freont Nicoara from Agrij and Chendre of Petre Brudului.