This book constitutes the refereed proceedings of the Third International Workshop on Hybrid Metaheuristics, HM 2006, held in Gran Canaria, Spain, in October 2006.

The 13 revised full papers presented together with 1 invited paper were carefully reviewed and selected from 42 submissions. Topics of this new emerging field addressed by the papers are novel combinations of components from different metaheuristics, hybridization of metaheuristics and Al/OR techniques, low-level hybridization, high-level hybridization, portfolio techniques, expert systems, co-operative search, taxonomy, terminology, classification of hybrid metaheuristics, co-evolution techniques, automated parameter tuning, empirical and statistical comparison, theoretic aspects of hybridization, parallelization, and software libraries.