墟市 (xū shì) is a dialectal term—especially common in southern China, including Guangdong and Guangxi—that refers to a periodic rural market, typically held on specific days in a village or small town. The character 墟 (xū) originally meant 'ruins' but evolved in regional usage to denote a traditional open-air market site, often set up in an open field or plaza; 市 (shì) means 'market' or 'commerce'. Together, 墟市 emphasizes the informal, community-based nature of these gatherings, where farmers, artisans, and vendors sell fresh produce, livestock, handmade goods, and daily necessities.

Unlike modern supermarkets or permanent markets, a 墟市 is usually held weekly (e.g., every third or fifth day), following local custom. It serves not only as an economic hub but also as a social center where people catch up, exchange news, and celebrate seasonal festivals. Though less common in urban areas today, 墟市 remains culturally significant and is often revived for heritage tourism or agricultural fairs.