Lapai is a Local Government Area in Niger State, Nigeria, adjoining the Federal Capital Territory. Its headquarters are in the town of Lapai on the A124 highway in the west of the area at.
It has an area of 3,051 km² and a population of 110,127 at the 2006 census. The area is roughly coterminous with the Lapai Emirate.
The postal code of the area is 911.