Washington Treaty

The Treaty of Washington may refer to:
* Treaty of Washington (1805), between the Federal government and the Creek National Council
* Treaty of Washington (1826), between the Federal government and the Creek National Council led by Opothleyahola.
* Treaty of Washington (1836), a U.S.-Native American (Ottawa and Chippewa) treaty
* Webster-Ashburton Treaty of 1842. It settled the border dispute between Canada and the Eastern States, such as Maine and Vermont. It helped to end the slave trade.
* The Oregon Treaty of 1846, which established the US-British frontier west of the Rocky Mountains (today's US-Canada boundary)
* Treaty of Washington (1855), between the U.S. and Ojibwa
* Treaty of Washington (1858), between the U.S. and Dakota
* Treaty of Washington (1866), between the U.S. and the Potawatomi
* Treaty of Washington (1867), between the U.S. and the Potawatomi
* The Treaty of Washington (1871), a general agreement between the United States and the British Empire
* The International Meridian Conference of 1884 in Washington DC, establishing the Greenwich Meridian, the world time zone system and the universal day as international standards
* The Washington Naval Treaty of 1922 that limited naval armaments
* The Treaty of Washington (1944), between the United States and Mexico on the sharing of transboundary rivers
* The North Atlantic Treaty of 1949 that created NATO
* The Treaty on Intellectual Property in respect of Integrated Circuits (1989)
* The Convention on the International Trade in Endangered Species of Wild Flora and Fauna