Tsugaru Strait (津軽海峡, Tsugaru Kaikyō) is a channel between the islands of Honshu and Hokkaido in northern Japan. It connects the Sea of Japan with the Pacific Ocean. It was named after the western part of Aomori Prefecture.
A warm current (Tsushima-kairyū) runs through the straight from south to north.
The Seikan Tunnel passes under the strait at its narrowest point. This is between Tappi Misaki on the Tsugaru Peninsula in Aomori in Honshū and Shirakami Misaki on the Matsumae Peninsula in Hokkaidō.