Tonquin may refer to:
Ships Tonquin (1807), an American merchant vessel destroyed on Vancouver Island in 1811 Tonquin (1845), a later American commercial vessel that sank in 1849 near San Francisco, CA SS City of Paris (1865), a French steamship briefly named Tonquin that sank in 1885
Locations Tonquin Valley, a valley located in Alberta Tonquin Pass, a mountain pass in the Canadian Rockies Tonquin, Oregon, an unincorporated locale of Oregon
Vietnam Tonkin, the northern region of Vietnam Tonquin War, an alternative name for the Sino-French War
Plants Tonquin bean, a flowering pea tree native to Central and South America