This book constitutes the thoroughly refereed proceedings of the 21st International Conference on Computer Processing of Oriental Languages, ICCPOL 2006, held in Singapore in December 2006, co-located with ISCSLP 2006, the 5th International Symposium on Chinese Spoken Language Processing. Coverage includes information retrieval, machine translation, word segmentation, abbreviation expansion, writing-system issues, semantics, and lexical resources.