Omakau (sometimes spelled Ōmakau) is a settlement in Central Otago, New Zealand, located between Alexandra and Ranfurly on the northwest bank of the Manuherikia River.

[3] The New Zealand Ministry for Culture and Heritage gives a translation of "belonging to husband and wife" for Ōmakau.

Today Omakau has a population of about 250, and is a stopover on both State Highway 85 and the Otago Rail Trail.

[5] Omakau is the site of many historic buildings, including the local hotel built in 1898 and the Catholic Church.

Omakau also hosts the Central Otago A&P Show at the local domain, which attracts people from all over the country in February.

The urban area of Omakau (between Alton and Harvey streets) covers 0.38 km2 (0.15 sq mi) and had a population of 141 in the 2018 New Zealand census.

The Statistics New Zealand description relates to a larger area including Ophir which covers 21.47 km2 (8.29 sq mi).