Tonkin is an exonym for Northern Vietnam.
Tonkin may also refer to:
Vietnam
Đông Kinh, a former name of Hanoi, Vietnam the French protectorate of Tonkin, the northern part of French Indochina Gulf of Tonkin, a gulf in the South China Sea Gulf of Tonkin incident, a 1964 naval incident that precipitated the Gulf of Tonkin Resolution Gulf of Tonkin Resolution, the 1964 resolution of the US Congress that precipitated the buildup of US forces in Vietnam In France, the Sino-French War (1884–1885) is termed the Tonkin War. the Tonkin Affair, a political crisis in France
Other Tonkin (surname) Tonkin Highway, a major arterial road in Perth, Western Australia Tonkin Railway in Switzerland Tonkin Street in Hong Kong Tonkinese cat, cat breed A type of Bamboo (Arundinaria amabilis or Pseudosasa amabilis). Tokyo