Ohaba (Hungarian: Székásszabadja; ‹See Tfd›German: Neudorf) is a commune located in Alba County, Transylvania, Romania. It is composed of four villages: Colibi (Székás), Măghierat (Magyarádtanya), Ohaba, and Secășel (Szekasbesenyö; Heidendorf).

The commune is located in the eastern part of the county, on the banks of the river Secaș and its left tributary, the Ohaba.

At the 2011 census, the commune had a population of 757; of those, 92.73% were ethnic Romanians and 2.51% Roma. At the 2021 census, the population had dropped to 538, of which 90.15 were ethnic Romanians.

• Sebastian Rusan [ro] (1884–1956), Orthodox cleric, Archbishop of Iași, Metropolitan of Moldavia and Bukovina