Nanosesarma minutum (De Man, 1887) is the only species of Nanosesarma Tweedie, 1950 known thus far in Taiwan. Two additional species of con-genus, N. andersoni (De Man, 1887) and N. vestitum (Stimpson, 1858) are newly recorded through the present study. Taiwan is the southernmost point of N. vestitum's distribution in the world. The morphology, ecological notes and a key to these three species found in Taiwan are also provided.