The Workshop on Planetary-Scale Distributed Systems will take place on September 28, 2015, in Montreal, Canada, and is co-located with the SRDS 2015 conference. The goal of the workshop is to bring researchers and practitioners from the large-scale distributed systems communities to discuss the current state of the art, emerging challenges and trends, as well as novel solutions, implementation and deployment of large scale, and in particular of planetary-scale, distributed systems and applications. The Call for Papers for W-PSDS 2015 is available, please consider submitting your work.