Outstanding Paper Awards Subcommittee of Journal of Chemical Engineering of Japan has assessed the 137 papers published in volume 48 into 2015, and the editorial board finally selected the five papers for JCEJ Outstanding Paper Awards of 2015; those are the papers on "Optimal Structure Synthesis of Internally Heat Integrated Distillation Column", "Effects of Annealing on the Morphology and Porosity of Porous TiO2 Films Fabricated by Deposition of Aerosol Nanoparticles", "Solid-Liquid Separation Properties in Centrifugal Sedimentation of Bidisperse Colloidal Suspension","Effect of Aperture Structure of Dutch Weave Mesh on Flow Resistivity", and "Effects of Solution Concentrations on Crystal Growth of Anthracene Thin Films on Silicon by Rapid Expansion of Supercritical Solutions (RESS) Using Carbon Dioxide".