Innovation does not only demand new ideas, financial resources and knowledge of supplier and user systems, but is also influenced by social capital which has an impact on the innovativeness in business networks. However, social capital is often vague, at times described as a “catch-all notion”. In this paper definitions of social capital are suggested to support the management of innovation in networks. Three dimensions of social capital are ap- plied in a case study of a regional strategic network – the socio-economic, the structural and the actor-oriented dimensions – while focusing on the last one. Data were collected at two points in time, at the start of the regional strategic network in 2004 and at the end of the project in 2010. The application of the concepts and the compar- ison between these two points in time highlight the influence of social capital and how it can hinder or be used to promote innovation processes.