The book "Advances in Swarm and Computational Intelligence" is a comprehensive collection of research findings presented at the 6th International Conference on Swarm Intelligence (ICSI 2015). This conference was held in conjunction with the second BRICS Congress on Computational Intelligence (CCI 2015) in Beijing, China, in June 2015. The 161 revised full texts, selected from 294 submitted papers, are organized into 28 thematically coherent sections. These sections cover a wide range of topics relevant to research and development in the fields of swarm intelligence and computational intelligence. The subjects addressed range from novel swarm-based optimization algorithms and their applications to various approaches in artificial intelligence, including neural networks, evolutionary algorithms, and machine learning. The book is aimed at professionals and students interested in the latest developments in these dynamic research areas.