Benten-jima (弁天島) is a small deserted island west by northwest of Cape Sōya, Wakkanai, Hokkaidō, Japan.

The island is 1 km (0.54 nmi) north of Sannai settlement.

Another island called Hira-shima (平島) lies southeast of Benten-jima.

Benten-jima is 0.5 hectares (1.2 acres) in area, its perimeter is roughly 500 metres (1,600 ft), and its highest point is 20 metres (66 ft) above sea level.

The wildlife includes many seabirds, Steller sea lions, kombu kelp, and sea urchins; it has been recognised as an Important Bird Area (IBA) by BirdLife International because it supports a large breeding colony of black-tailed gulls.