The aim of this article is to discuss the concept of virtual organizations (VO´s) as dynamic co-operation networks, that is as a form of co-operation among enterprises, organizations and institutions, that, by the intensive application of the new information and communication technologies (ICT´s), look for powered the competitiveness of the partners belong to this network. This kind of network aims at the exploration of new opportunities in the global market. Besides a bibliographical revision, the study presents and discusses some paradigmatic cases of virtual organizations, detaching experiences of several countries: New England, Switzerland, Mexico and Brazil.The aim of this article is to discuss the concept of virtual organizations (VO´s) as dynamic co-operation networks, that is as a form of co-operation among enterprises, organizations and institutions, that, by the intensive application of the new information and communication technologies (ICT´s), look for powered the competitiveness of the partners belong to this network. This kind of network aims at the exploration of new opportunities in the global market. Besides a bibliographical revision, the study presents and discusses some paradigmatic cases of virtual organizations, detaching experiences of several countries: New England, Switzerland, Mexico and Brazil.O presente artigo visa discutir o conceito de organizações virtuais (OVs) como redes dinâmicas de cooperação, ou seja, como uma forma de cooperação entre empresas, organizações e instituições, que, por meio da utilização intensiva das novas tecnologias da informação e comunicação (TICs), buscam potencializar a competitividade dos parceiros desta rede, viabilizando a exploração de novas oportunidades de mercado em nível global. Além de uma revisão bibliográfica sobre o tema, o trabalho apresenta e discute alguns casos paradigmáticos de organizações virtuais, destacando experiências de diversos países: Inglaterra, México, Suíça e Brasil.