The aim of the raport "Open Science in Poland 2014. A Diagnosis" is to present a comprehensive overview of the current state of openness in Polish science. In chapter 1, the authors present the institutional context of Open Science in Poland. In chapter 2, they analyse its selected legal aspects. In chapter 3, the current e-infrastructure of Open Access is described. Chapter 4 summarizes the results of desk research and a survey of Polish scientific journals conducted for the purpose of the report, while chapter 5 is devoted to the survey involving Polish scientists. Chapter 6 is concerned with forms of Open Science other than Open Access and open data. The report, edited by Jakub Szprot, was prepared as part of the Open Science Platform activities. It's available under the Creative Commons Attribution 3.0 PL licence.