Hecate Strait (; Haida language: K_andaliig_wii, also siigaay which means simply "ocean") is a wide but shallow strait between the Haida Gwaii (formerly the Queen Charlotte Islands) and the mainland of British Columbia, Canada. It merges with Queen Charlotte Sound to the south and Dixon Entrance to the north. About wide at its southern end, Hecate Strait narrows in the north to about It is about in length.