Rasshua (Russian: Расшуа, Japanese: 羅処和島) is an uninhabited volcanic island near the center of the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean, 16 kilometres (9.9 mi) from Ushishir and 30 kilometres (19 mi) southwest of Matua.

[1] The island is a complex stratovolcano with three overlapping central cones within a 6 kilometer caldera whose eastern margin is beyond the shoreline.

The peak has not erupted in historic times, although it emits quantities of volcanic gas and its sides are streaked with sulfur deposits.

The easternmost cone (Japanese: 長頭山, romanized: Chōtōzan; (Russian: гора Циото) with a height of 503 metres (1,650 ft), violently erupted in 1846.

After World War II, the island came under the control of the Soviet Union, and is now administered as part of the Sakhalin Oblast of the Russian Federation.