This article on student mobility data in Europe has a double objective: First, it investigates which data on international mobility of students are being compiled and made available--and which are not--both at the international, the national, and the programme level. Second, it presents some of the student mobility data identified, and--based on an analysis of these data--it tries to depict a picture of the main trends in international student mobility into and out of 32 European countries. Next to analysing and presenting the availability and quality of data on international student mobility, the article also makes recommendations for the improvement of student mobility statistics both at the national and international levels. (Contains 9 tables.)