The result from examination of calcium oxalate crystal in some local vegetables in southern Thailand 20 species : Kratogrog, Kamin, Jigna, Chamoung,Todmutodma, Taoyanang, Thummung, Prongsoun, Phuksean, Magug, Mamounghimmapan, Munpu, Munsumpalung, Yotuan, Lepkrut, Sadateam,Samedchun, Hussakhun, Hangprachon and Meang. Studies by peeling method and free hand section. The result showed that calcium oxalate crystals was found in all samples (especially in Thummung) except 3species: Prongsoun, Mamounghimmapan and Hangprachon. There were 6 shapes: druse, raphide, rosette, sand, collumnar and prism