Compared to the trends of the OECD countries, the proportion of graduated higher educational students is low in Hungary, especially in the doctoral education; however, the need for doctoral education has been increased due to the expansion in the past two and half decades. According to the report of the European Committee, the ratio of those having a PhD degree is 0.8 per mille among the 25- to 34-year-old Hungarian population that is not advantageous. As a causal factor, the dropout can be detected. The aim of my investigation is to detect the pattern of the dropout of the doctoral students. Who are those who quit their studies before finishing it? In which field is the ratio of graduation the lowest? I hypothesize that approximately one fifth of the students enrolled for a doctoral course quit their studies during the education. According to the educational fields, the dropout ratio is the lowest in the natural, medical, and agricultural sciences, whereas it is the highest in the arts, human, and social sciences. The basis of the current research is provided by a huge national database entitled Higher Educational Informational System, containing the data of doctoral students enrolled in the autumn semester of the school years 2010/2011 and 2014/2015.