The Shimokita Peninsula (下北半島, Shimokita-hantō) is the remote northeastern cape of the Japanese island of Honshū, stretching out towards Hokkaidō.

It is bordered by the Pacific Ocean to the east, Tsugaru Strait to the north and Mutsu Bay to the west and south.

Economically, the mainstays of the local economy are commercial fishing, forestry, and seasonal tourism.

The village of Rokkasho, at the southern end of Shimokita Peninsula, home to a range of nuclear facilities.

In 2012, Japan set a new world record for ocean drilling depth, reaching 2,111 meters below the seafloor off Shimokita Peninsula.