Nottinghamshire ( /ˈnɒtɪŋəmʃər/ or /ˈnɒtɪŋəmʃɪər/; abbreviated Notts) is a county in the East Midlands of England, bordering South Yorkshire to the north-west, Lincolnshire to the east, Leicestershire to the south, and Derbyshire to the west. The traditional county town is Nottingham, though the county council is based in West Bridgford in the borough of Rushcliffe, at a site facing Nottingham over the River Trent.

The districts of Nottinghamshire are Ashfield, Bassetlaw, Broxtowe, Gedling, Mansfield, Newark and Sherwood, and Rushcliffe. The City of Nottingham was administratively part of Nottinghamshire between 1974 and 1998 but is now a unitary authority, remaining part of Nottinghamshire for ceremonial purposes.

As of 2006 the county is estimated to have a population of just over one million. Over half of the population of the county live in the Greater Nottingham conurbation (which continues into Derbyshire). The conurbation has a population of about 650,000, though less than half live within the city boundaries.