In this article, the authors establish a new dextral species of camaenid land snail, Satsuma mii sp. nov. distributed in southeast Taiwan. This newly-described Satsuma land snail is of medium size, festucine to light brown in shell color, with semi-arboreal and herbivorous ecological habits. The new species can be distinguished from three other established dextral congenera species distributed in eastern Taiwan, S. litus, S. paradoxa and S. chengi by anatomical traits, morphological characters and geographical non-overlapping.