Highcliffe-on-Sea (usually simply Highcliffe) is a seaside town in Dorset in England, administered since April 2019 as part of the unitary authority of Bournemouth, Christchurch and Poole. It forms part of the South East Dorset conurbation along the English Channel coast. The town lies on a picturesque stretch of Solent coastline with views of the Isle of Wight and its 'Needles' rocks. It is part of the historic county of Hampshire.