Rank Island name Area (km2) Area (sq mi) Island group 1 Honshu 227,960 88,020 2 Hokkaido 83,424.31 32,210.31 3 Kyushu 36,782 14,202 4 Shikoku 18,800 7,300 5 Okinawa Island 1,207 466 Ryukyu Islands 6 Sado Island 855.26 330.22 7 Amami Ōshima 712.35 275.04 Amami Islands 8 Tsushima Island 708.7 273.6 9 Awaji Island 592.17 228.64 Seto Inland Sea islands 10 Shimoshima Island, Amakusa 574.01 221.63 11 Yakushima 504.88 194.94 Ōsumi Islands 12 Tanegashima 444.99 171.81 Ōsumi Islands 13 Fukue Island 326.43 126.04 Gotō Islands 14 Iriomote Island 289.27 111.69 15 Tokunoshima 247.8 95.7 Amami Islands 16 Dōgojima 241.58 93.27 Oki Islands 17 Kamishima Island, Amakusa 225.32 87.00 Amakusa islands 18 Ishigaki Island 222.5 85.9 19 Rishiri Island 183 71 20 Nakadōri Island 168.34 65.00 Gotō Islands 21 Hirado Island 163.42 63.10 22 Miyako-jima 158.87 61.34 23 Shōdoshima 153.30 59.19 24 Okushiri Island 142.97 55.20 25 Iki Island 138.46 53.46 26 Suō-Ōshima 128.31 49.54 27 Okinoerabujima 93.63 36.15 Amami Islands 28 Etajima 91.32 35.26 29 Izu Ōshima 91.06 35.16 Izu Islands 30 Nagashima Island, Kagoshima 90.62 34.99 31 Rebun Island 80 31 32 Kakeromajima 77.39 29.88 Amami Islands 33 Kurahashi-jima 69.46 26.82 34 Shimokoshiki-jima 66.12 25.53 35 Ōmishima Island, Ehime 66.12 25.53 36 Hachijō-jima 62.52 24.14 37 Kume Island 59.11 22.82 Okinawa Islands 38 Kikaijima 56.93 21.98 Amami Islands 39 Nishinoshima 55.98 21.61 40 Miyake-jima 55.44 21.41 41 Notojima 46.78 18.06 42 Kamikoshiki-jima 45.08 17.41 43 Ōshima (Ehime) 41.87 16.17 44 Ōsakikamijima 38.27 14.78 45 Kuchinoerabu-jima 38.04 14.69 46 Hisaka 37.23 14.37 47 Innoshima 35.03 13.53 48 Nakanoshima (in Kagoshima) 34.47 13.31 Tokara Islands 49 Hario Island 33.16 12.80 50 Nakanoshima (in Shimane) 32.21 12.44 Oki Islands