CZO may refer to:
Critical Zone Observatory, an interdisciplinary research project
CZO (language), a Chinese dialect
Central Min, or Min Zhong ( ), is a member of the Min subcategory of Chinese languages. It is spoken around Yong'an, Sanming and Sha located in the central mountain areas of Fujian. The total population of approximately 3,000,000 native speakers, is the fourth most common variety of the Min branch of Chinese languages.