The 3rd International Conference of Energy Harvesting, Storage, and Transfer (EHST'19) aims to become the leading annual conference in fields related to energy harvesting, storage, and transfer. The goal of EHST'19 is to gather scholars from all over the world to present advances in the fields of energy harvesting, storage, and transfer and to foster an environment conducive to exchanging ideas and information. This conference will also provide an ideal environment to develop new collaborations and meet experts on the fundamentals, applications, and products of the mentioned fields. EHST is an acronym for Energy Harvesting, Storage, and Transfer.