Hertford Heath nature reserve is a 28 hectare biological Site of Special Scientific Interest in Hertford Heath in Hertfordshire. It is managed by the Herts and Middlesex Wildlife Trust and the local planning authority is East Hertfordshire District Council. The reserve is in two parts on either side of London Road. The southern part is accessed from The Roundings, next to the College Arms public house. It adjoins Balls Wood, which is also managed by the Herts and Middlesex Wildlife Trust. The northern area is off Heath Lane, opposite the pub.