"Advances in Information Retrieval" is a comprehensive collection of research papers documenting the proceedings of the 35th European Conference on Information Retrieval (ECIR 2013). This conference took place in March 2013 in Moscow, Russia, and attracted a wide range of contributions addressing the latest developments and challenges in the field of information retrieval technologies. This volume includes 55 full papers, 38 posters, and 10 demonstrations, selected from a total of 287 submitted works. The contributions are organized into various thematic sections covering important aspects such as user interactions, multimedia and cross-media IR, data analysis, theoretical models, system architectures, and specific applications like web and microblog search. Additionally, tutorials and workshops are included, providing valuable insights into current trends and techniques.