Unirea, previously Vințu de Sus (Hungarian: Felvinc, German: Oberwinz), is a commune located in the north-east of Alba County, Transylvania, Romania.

The first documentary evidence of the commune dates from 1219 under the names Vynch superior, terra Wynchy, Oronos Winch, and Oranas Wincz.

The Romanian version of the name, Vințu de Sus, became official only after the Union of Transylvania with Romania in 1918.

In 1925, the official name was changed to Unirea referring to the unification of Vințu de Sus and Vereșmart.

As part of the Kingdom of Hungary, the Hungarian version was consistently used throughout the Middle Ages, with the mention that sometimes the form Aranyosvinc and Felső-Vincz were also used.

While the share of the Romanian majority in the territory of the present-day commune has remained almost constant since the mid-19th century (with a slight 5% increase), the two main minorities, the Hungarians and the Roma, have experienced opposite trends.