In our present investigations, distributions of Korean Aceraceae with single genus composed of 16 species, 14 varieties and 1 form were studied. Distributional atlases were made by UTM grid map and drawing methods have been previously described (Distribution Atlas of Plants of Korea I, II, and III). Acer okamotoanum and A. takesimense of Korean endemic species are commonly distributed in Dagelet Island but the latter also in such islands as Quelpart, Wan-Do and Heucksan-Do. A. palmatum var. nakaii is found in the middle and the northern parts of the subtropics, and A. micro-sieboldianum and A. nudricarpum restricted to the middle part of the country are endemic species of Korea. A. barbinerve and A. tegmentosum as species from the north are distributed to the top of Mt. Chiri in the south and are also found in Mt. Nangrim and Baiktu in the north. A. ginnala and A. mono are commonly distributed in Liaotung-Pantao and Shantung-Pantao, or Chinese peninsulas, and South Manchuria with Korean Peninsula. A. barbinerve, A. tegmentosum, A. triflorum, A. tschonoskii and A. ukurunduense in south Manchuria, north Manchuria and Korea are florae derived from Manchuria, and A. japonicum, A. momo var. ambiguum, A. mono var. savatieri, A. palmatum var. matsumurae and A. ukurunduense var. pilosum appear in Korea and Japan.