Granular materials, alone or in combination with a fluid, are ubiquitous in both nature and industry. These materials show a rich variety of complex phenomena in these settings. As the physical underpinnings of these behaviors continue to be revealed and new phenomena continue to be discovered, there has been sustained and strong international research on this topic with contributors spanning multiple disciplines including chemical, civil and mechanical engineering, physics, applied maths, and earth and planetary sciences. In addition, there are intriguing links between granular materials and systems such as glasses, colloids, emulsions and foams. This Fifth Gordon Conference on Granular and Granular-Fluid Flows will afford active researchers in the field an opportunity to learn about recent discoveries and to engage in discussions with their colleagues. Invited speakers and discussion leaders will catalyze these interactions by addressing a range of topics such as dilute and dense phase flows, jamming, regime transitions, multiphase systems, avalanches, instabilities, patterns, segregation/mixing, and related phenomena.