Science centres and museums are increasingly active in lobbying on a European and international level. Work done with the Commission through European projects, Ecsite’s Parliament Event in February 2009, the presence of Ecsite and the World Ocean Network at the COP15 in Copenhagen as observer institutions through the ACCENT project, and the United Nations official collaboration in World Ocean Day are examples of this phenomenon. What are the aims of this advocacy work, how can it be best achieved, and how can we mobilise a European community in order to have the biggest political impact?