Days on Diffraction - 2015 will be the five-day Conference, 25 – 29 May, 2015. Venue for the first four days is St. Petersburg Branch of the Steklov' Mathematical Institute. Parallel sessions will be organized there, the time slot for each presentation is 15 or 30 minutes (total amount of presentations is expected to exceed 150). Last day Conference moves to the Institute on Physics at the University campus (transportation for participants will be provided) and is devoted to the plenary sessions (consisting of 40–50 minutes lectures) and to the poster presentations.