Omakau is a settlement in Central Otago, New Zealand, located between Alexandra and Ranfurly on the northwest bank of the Manuherikia River. The smaller settlement of Ophir, New Zealand is located on the opposite bank, three kilometres to the southeast.
The New Zealand Ministry for Culture and Heritage gives a translation of "belonging to husband and wife" for Ōmakau.
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.