Iernut (Hungarian: Radnót, pronounced [ˈrɒdnoːt]) is a town in Mureș County, central Transylvania, Romania.

It administers eight villages: Cipău (Maroscsapó), Deag (Marosdég), Lechința (Maroslekence), Oarba de Mureș (Marosorbó), Porumbac (Porumbáktanya), Racameț (Józseftanya), Sălcud (Szélkút), and Sfântu Gheorghe (Csapószentgyörgy).

The partially built A3 motorway (Autostrada Transilvania), which connects Bucharest to the Hungarian border near Oradea, runs just south of the town.

Frequent invasions forced Michael I Apafi, Prince of Transylvania, to convoke the Transylvanian Diet to the fortress of Radnót in the late 1680s.

At the start of the Hungarian–Romanian War of 1918–1919, the locality passed under Romanian administration; after the Treaty of Trianon of 1920, it became part of the Kingdom of Romania.