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A Master of Social Science (MSSc or MSS) is a master's degree which has a number of different meanings dependent upon the education system in question.
In Finland and Sweden, where the university degree nomenclatura is simply based on the faculties from which they are awarded, Master of Social Science is the name given to any master's degree awarded by the Faculty of Social Science. This is just as the Faculty of Theology awards Masters of Theology (M.Th.), the Faculty of Arts awards Masters of Fine Arts (M.F.A.), and so forth. Consequently, Master of Social Science degrees are quite common in Finland and Sweden. Examples of majors in Master of Social Science degrees in Sweden include peace and conflict studies , economics  and statistics .
In the United Kingdom, MSSc degrees are unusual and are almost always postgraduate in nature. Common subjects that would lead to the award of MSSc include but are not limited to social work, criminology, politics, and sociology.
It is also available at the National University of Singapore, University of Hong Kong, Chinese University of Hong Kong, and several Danish universities, including Copenhagen University, Copenhagen Business School, Aalborg University, and Roskilde University, in a number of subjects.