North Ambersham is a former civil parish, now in the parish of Fernhurst, in the Chichester district of West Sussex, England. Until 1844 North Ambersham was a detached part of Hampshire and was a tithing of the parish of Steep. Under the Parliamentary Boundaries Act 1832 and the Counties Act 1844, it was annexed to Sussex. For ecclesiastical purposes this tithing was attached to Fernhurst. In 1866 North Ambersham became a separate civil parish, on 1 April 1972 the parish was abolished and merged with Fernhurst. In 1971 the parish had a population of 176.