The objective of this article is two-fold: first, it studies how German universities organize their purchasing activities, and, second, it identifies patterns in the structure of the purchasing function and analyzes factors that influence the design of purchasing. For this purpose, the article develops an analytical framework based on ideas of contingency and organization theory and presents the results of an empirical study which analyzed the purchasing organization of 65 German universities. The results of the study indicate that German universities use a medium level of centralization and specialization to organize their purchasing activities, and that the purchasing process is highly formalized in most universities. As to influential factors of the structure of purchasing, the study indicates that the number of employees, the number of employees with purchasing-responsibility, the purchasing volume, and the number of students enrolled at the university influence the structural variables.