This book constitutes the proceedings of the SecondOpenSHMEM Workshop, held in Annapolis, MD, USA, in August 2015.The 12 technical papers and one short position paperspresented in this book were carefully reviewed and selected from 17submissions. The topics of the workshop included extensions to the OpenSHMEMAPI, implementation of the API for current and emerging architectures, tools todebug and profile OpenSHMEM programs, experience porting applications to theOpenSHMEM programming model, and changes to the OpenSHMEM specification toaddress the needs of programming exascale systems.