IT projects continue to fail at a high rate and this represents losses in both money and opportunity organizations. This leads us to continue studying success factors in projects. The aim of this paper is present a systematic literature review focused on soft skills for the IT project success. The literature search was conducted using the electronic databases and the primary articles from 2010 to 2017. The results show that a high number of studies are theoretical, conceptual or based on experience and there are no models that explain the causal relationship between soft skills and project success. All studies agree about the relevance of the project manager soft skills for projects success. The results show that the most influence soft skills for projects success are communication, leadership and conflict resolution skills.