This workshop will explore the physics opportunities of a 100 TeV proton-proton collider.  Both the European Strategy for Particle Physics and the Snowmass 2013 study in the US emphasized that it is important to begin looking beyond the LHC program to proton colliders at higher energies.  Significant effort has been devoted to studies at LHC accessible energies, but relatively few studies have been performed well beyond 14 TeV.  Our goal is to provide a forum to report and discuss first results on physics processes in this higher energy regime.  We view this workshop as part of a global program to understand what physics can be done at a proton collider with energy much higher than that of the LHC.