This book collects contributions presented in the seventh edition in a series of Workshop on High Energy Gamma-ray Experiments. The focus of the Workshop was on Gamma-ray Physics in the LHC Era. In order to understand the origin of the Universe reaserchers are nowadays using two powerful and complementary approaches. On one side radiation produced many years ago and now arriving to us from space, is studied with different experimental techniques. On the other one, particle accelerators can recreate in laboratory the high density high energy state present at the beginning of the Universe. Results are here presented from experiments in space, on earth and underground, regarding cosmic radiation.