This article investigates networks and political actions by migrant organisations in five European cities. It examines how political opportunity structures moderate the impact of organisational networks on organisations' political contacts and protests using data from organisational surveys undertaken between 2005 and 2008 in Budapest, Lyon, Madrid, Milan and Zurich. Results suggest that the political context moderates the role that different types of networks have on mobilisation. It is found that migrant organisational networks may be sources compensating for the lack of contextual opportunities, thus fostering the use of protest by migrant organisations. However, migrant organisational networks can also favour the creation of political subcultures, marginalised from mainstream politics. Finally, migrant networks are likely to foster migrant organisations' political integration in multicultural contexts through conventional as well as non-conventional politics.