Orhionmwon is a Local Government Area of Edo State, Nigeria. Its headquarters is in the town of Abudu. It has an area of 2,382 km² and a population of 206,717 at the 2006 census. The postal code of the area is 301.

Orhionmwon local government area of Edo State considered one of the biggest local government area among those in Benin City. It comprises towns and communities such as Idomodin, Ottah, Edummungba, Egbhuru, Egbokor, Ute – Oheze, Ugo, Urhonigbe, Igbanke, Iru egbede, Evbobanosa, Oza, Ogan, Uson, Oloten, Obagie N’Oheze, Idumiru, Idumwebo, Numagbae, Ugokoniro, Ukpato, Igbekhue, iguehanza, Obozogbe-niro and Obi. The local government came about in the aftermath of the creation of the defunct Bendel State. the local government is blessed with rubber plantation,agricultural produces,crude oil as well as mineral resources. Furthermore, the local government is surrounded by neighboring Delta State (Agbor and Eku) as well as communities such as Ugo and Okogbo.