The aim of the present Masters thesis “NO HOME AND HOMELESS? EU-citizens in the Viennese Assistance to the Homeless.” was to elaborate challenges organisations of the Viennese Assistance for homeless people working with EU-citizens are facing. Therefore, eight guided interviews with experts were conducted, analysed and interpreted according to the topic analysis of Froschauer/Lueger. On basis of the findings the heterogeneous target group was clustered according their specific characteristics into the following: migrant workers, poverty-driven migrants, long-term homeless persons from neighbouring countries, long-term homeless persons, living in Vienna as well as “stranded” persons. Since each of the groups is affected by specific challenges, the findings were outlined along the presented scheme and in a further step possible actions for Social Work to tackle the problems introduced. Subsequently findings were discussed, key challenges summarised and ways to overcome them presented, including the need for all-year night shelters, access to addiction treatment, provision of nursing as well as the implementation of measures on a European level regarding the use of social services in another member state.