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