Mihai Viteazu (archaic: Sânmihaiu; Hungarian: Szentmihály; German: Michelsdorf) is a commune in Cluj County, Transylvania, Romania.

It is composed of three villages: Cheia (Mészkő), Cornești (Sinfalva), and Mihai Viteazu.

Mihai Viteazu village, which is named after the medieval ruler Michael the Brave (Romanian: Mihai Viteazu), was founded in 1925 by the merging of two villages, Sânmihaiu de Jos (Alsószentmihály) and Sânmihaiu de Sus (Felsőszentmihály).

Those two, together with Cornești and Cheia, were first mentioned in documents in the 14th century, after the settlement of Székelys in the Aranyos Seat area.

66.6% were Romanian Orthodox, 13.8% Unitarian, 10.1% Reformed, 4% Roman Catholic, 2.4% belonged to another religion, and 0.9% Pentecostal.