Ōhau is a village and semi-rural community in the Horowhenua District and Manawatū-Whanganui region of New Zealand's North Island.

[10] Ōhau is defined by Statistics New Zealand as a rural settlement and covers 4.47 km2 (1.73 sq mi).

Before the 2023 census, the settlement had a larger boundary, covering 6.12 km2 (2.36 sq mi).

Although some people chose not to answer the census's question about religious affiliation, 52.3% had no religion, 36.0% were Christian, 0.5% had Māori religious beliefs, 0.5% were Hindu, 0.5% were Muslim and 0.9% had other religions.

Before the 2023 census, the statistical area had a larger boundary, covering 42.23 km2 (16.31 sq mi).

Although some people chose not to answer the census's question about religious affiliation, 52.8% had no religion, 35.1% were Christian, 0.4% had Māori religious beliefs, 0.6% were Hindu, 0.1% were Muslim, 0.4% were Buddhist and 1.5% had other religions.