DIEM stands for Department of Industrial Engineering and Management (Finland)
DIEM stands for Danish Institute of Electroacoustic Music
DIEM stands for Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (Italian: Mechanical Engineering Department)
DIEM stands for Droit et Immigration Europe-Maghreb (French: Immigration Law and Europe-Maghreb)
DIEM stands for Dansk Institut for Elektronisk Musik (Danish: Danish Institute of Electronic Music; est. 1987; Denmark)
DIEM stands for Testing a Diffusion of Innovations in Education Model (Mark K. Warford book)
DIEM stands for Diploma in International Event Management (academic program)