The 15th International Conference on Transport in Interacting Disordered Systems (TIDS15) will take place September 1-5, 2013 in Sant Feliu de Guíxols. The conference is a continuation of the biennial meeting traditionally called HRP (Hopping and Related Phenomena) and now named TIDS. Previous conferences took place in Trieste (1985), Bratislava (1987), Chapel Hill (1989), Marburg (1991), Glasgow (1993), Jerusalem (1995), Rackeve (1997), Murcia (1999), Shefayim (2001), Trieste (2003), Egmond aan Zee (2005), Marburg (2007), Rackeve (2009), and Acre (2011). Central to these conferences are systems lacking translational symmetry. In such systems interactions are often important. Dramatic differences in the behavior of crystalline solids and the "disordered" systems are possible. Some examples of the latter are amorphous materials, polymer aggregates, materials whose properties are governed by impurities, and biological systems.