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This paper describes the development of CU Corpora, a series of large-scale speech corpora for Cantonese. Cantonese is the most commonly spoken Chinese dialect in Southern China and Hong Kong. CU Corpora are the first of their kind and intended to serve as an important infrastructure for the advancement of speech recognition and synthesis technologies for this widely used Chinese dialect. They contain a large amomat of speech data that cover various linguistic units of spoken Cantonese, including isolated syllables, polysyllabic words and continuous sentences. While some of the corpora are created for specific applications of common interest, the others are designed with emphasis on the coverage and distributions of different phonetic units, including the contextual ones. The speech data are annotated manually so as to provide sufficient orthographic and phonetic information for the development of different applications. Statistical analysis of the annotated data shows that CU Corpora contain rich and balanced phonetic content. The usefulness of the corpora is also demonstrated with a number of speech recognition and speech synthesis applications.