The following Paper discusses strategies for the prevention of homelessness. Based on a comparison between Austria and Finland, the foundations of successful prevention strategies are to be worked out. Using the relevant literature, the term "homelessness" is first defined and placed in the country-specific context. Based on this, general causes of homelessness are discussed in order to finally present the situation in Austria and Finland. Subsequently the concept of prevention is defined and a theoretical model for the analysis of preventive measures introduced by Busch-Geertsema/Fitzpatrick is presented. Based on this concept, preventive measures to end homelessness in Austria and Finland are analyzed. Finally the question should be clarified, what Austria can learn from the Finnish prevention strategy. It turns out, that the success of the Finnish model is essentially based on three pillars. First, a nationwide and unified data collection on homelessness, second, a national strategy involving all relevant stakeholders, and third, a consistent Housing First concept.