Ground Penetrating Radar (GPR), magnetic and earth resistance surveys were conducted at Castilly Henge, Luxulyan, Cornwall, as part of a wider non-invasive study of the site, undertaken in support of work to remove Castilly henge from the Heritage at Risk (HAR) register. Historic England's (HE) Archaeological Investigation Team (AIT) has conducted a level 3 analytical earthwork survey, a contextual Aerial Investigation and Mapping (AIM) study of its immediate environs together with a geophysical survey of the scheduled monument that is the subject of this Oasis record. The geophysical survey was preceded by fencing and bracken management works undertaken as part of the Cornwall Archaeology Unit's (CAU) Monument Management Scheme (MMS), and it is hoped that the combined non-invasive investigation of the monument will provide a basis for the future management and presentation of the site. Ground Penetrating Radar (GPR), magnetic and earth resistance surveys were conducted at Castilly Henge, Luxulyan as part of a project to support ongoing work to remove the monument from the Heritage at Risk (HAR) register. Vehicle towed GPR survey (0.6ha) and earth resistance survey (0.1ha) revealed an eccentric ovoid arrangement of internal pits within the henge ditch, with a possible indication of recumbent stones. The response to the pits was less well defined in the magnetic data (0.4ha) and few significant anomalies were found with any of the techniques to the north of the henge beyond responses to a ferrous gas pipe, the underlying geology and former field boundary known from the historic mapping.