The Romanian Tier-2 Federation RO-LCG was established in 2006 following the conclusion of the Worldwide LHC Computing Grid (WLCG) collaboration’s Memorandum of Understanding between CERN and ANCS. Selected papers will be submitted to the IEEE Xplore database, for indexing. Since 2007, an annual RO-LCG workshop or conferences in alternatively held on topics related to the Grid and High Performance computing support for Particles Physics and scientific research in general. The RO-LCG 2015 conference is devoted to the exchange of information between various scientific communities working in Grid, Cloud computing and HPC. The event gathers representatives of national, international grid infrastructures, WLCG members and high-energy physicists, computer scientist, site administrator, grid, cloud and HPC users.