Obi () is a Local Government Area in Nasarawa State, Nigeria. Its headquarters are in the town of Obi. it other towns include Adudu Emirate, Agwatashi, Daddare, Jenkwe, Duduguru, Agyaragu, Tudun Adabu, Gude, and Riri.
It has an area of 967 km and a population of 148,874 at the 2006 census.
The postal code of the area is 951.
Temperatures range from 64ðF to 96ðF, rarely dropping below 58ðF or rising beyond 102ðF, and the weather is typically partly cloudy and overcast throughout the year.
Obi experiences high temperatures on a regular basis; March is the hottest month with a high of 96ðF.