Seini (German: Leuchtenburg; Hungarian: Szinérváralja) is a town in Maramureș County, Romania.

It administers two villages, Săbișa (Kissebespatak) and Viile Apei (Apahegy).

It officially became a town in 1989, as a result of the Romanian rural systematization program.

Seini is crossed by national road DN1C [ro] (part of European route E58), which runs from Cluj-Napoca north towards Baia Mare and the border crossing at Halmeu, where it connects with the Ukrainian highway M26.

The town has two train stations (Seini [ro] and Săbișa), both serving the CFR Main Line 400, which connects Brașov with Baia Mare and Satu Mare.