Iwaki Yumoto Onsen (いわき湯本温泉) is an onsen resort in Iwaki, Fukushima Prefecture in Japan.

Although known since the Nara period, the hot springs at Iwaki developed with borehole drilling in the Jōban Coal Fields in the Meiji period. To the west of the traditional onsen town is the Spa Resort Hawaiians.

• Three Ancient Springs

• Official website