This volume contains the Proceedings of the Third Symposium on Statistical Learning and Data Sciences, which was held at Royal Holloway, University of London, UK, during April 20–23, 2015. The original idea of the Symposium on Statistical Learning and Data Sciences is due to two French academics – Professors Mireille Gettler Summa and Myriam Touati – from Paris Dauphine University. Bac…