The notion of cultural diversity occupies a central place in social debates, especially since the adoption of Convention on the Protection and Promotion of Cultural Diversity (UNESCO, 2005). Since Spain activated its ratification, and supported its elaboration, this article wonder about its influence over the Spain official cooperation policy in the field of culture. The analysis proves a real impact in terms of both definition and planning and implementation: while the former can be detected in documents such as the Plan Director, the latter is reflected in AECID’s initiatives. Such impact, nevertheless, must be circumscribed to the multilateral level and the period 2005-2009.