During the period 1999-2000, spiders from coastal grey dunes were sampled in the Netherlands, Belgium and France. In this paper, we emphasise on the the spider data from two Dutch dune landscapes: the Amsterdam Water Supply dunes (AWD) and the Northern-Holland Dune Area (NHD). More in particular we address (i), how spider communities were structured in relation to vegetation characteristics, sand dynamics and general landscape composition, (ii), how diversity are affected by the latter factors and (iii), if we are able to identify indicator species for the environmental parameters that can be affected by nature management.