This thesis assesses the welfare of immigrants in Greece and examines the changes in their welfare following the outbreak of the economic crisis in 2009. Data from 320 structured interviews and 42 semi structured interviews with immigrants in urban and rural areas in Greece are analysed through Descriptive Analysis, Analysis of Variance (ANOVA) and Thematic Analysis. Analysis focuses on three aspects of immigrants' welfare: (i) labour market integration and income; (ii) living conditions; and (iii) social integration. Among the most distinctive findings are: (i) weakening labour market position of immigrants; (ii) declining ability to financially support themselves and their families; (iii) deteriorating quality of housing and neighbourhood conditions; and (iv) decreasing levels of social integration. It is suggested that those welfare changes are directly linked to the eruption of the Greek economic recession in 2009. Last, this deprivation of immigrants' welfare is of critical importance for humanitarian reasons, but also due to posing a serious threat for the political and socio-economic stability of Greece and the EU.