"Frontiers in Algorithmics" is a comprehensive collection of research papers documenting the proceedings of the 9th International Workshop on this topic, which took place in July 2015 in Guilin, China. This volume includes 28 carefully selected and peer-reviewed contributions that emerged from a total of 65 submitted papers. The topics covered encompass a wide range of algorithmic approaches, including graph algorithms, approximation algorithms, combinatorial optimization, parameterized algorithms, and online algorithms. This publication is aimed at professionals and students in the field of computer science and algorithmics, providing valuable insights into current developments and challenges in algorithm research.