The HepMC package is an object oriented, C++ event record for High Energy Physics Monte Carlo generators and simulation. The original code was written by M. Dobbs and J.B. Hansen (Comput. Phys. Commun. 134 (2001) 41). Since the first implementation, the package has undergone several modifications and in particular, the latest HepMC3 series is a completely new re-write using currently available C++11 techniques.