Odiham is a large historic village and civil parish in the Hart district of Hampshire, England. It is twinned with Sourdeval in the Manche Department of France. The 2011 population was 4,406. The parish in 1851 had an area of 7,354 acres with 50 acres covered by water. The nearest railway station is at Hook, on the South West main line. The village had its own hundred, named The Hundred of Odiham. The village is situated slightly south of the M3 motorway and approximately midway between the north Hampshire towns of Fleet and Basingstoke, some 37 miles north-northeast of Southampton and 43 miles (69 km) southwest of London.

Hart is a local government district in Hampshire, England, named after the River Hart. Its council is based in Fleet. The district also contains the towns of Blackwater and Yateley, along with numerous villages and surrounding rural areas.