The Treaty of Washington may refer to:
- Treaty of Washington (1805), between the U.S. and the Creek National Council (Muscogee (Creek))
- Treaty of Washington (1824), two Indian nation treaties, between the U.S. and the Sac (Sauk) and Meskwaki (Fox) (7 Stat. 229), and the Iowa (7 Stat. 231)
- Treaty of Washington (1826), between the U.S. and the Creek National Council led by Opothleyahola
- Treaty of Washington (1831), between the U.S. and the Menominee Indian Tribe.
- 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 Sioux
- 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 Treaty of Washington (1900) between Spain and the United States
- 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 of Washington (1989), Treaty on Intellectual Property in respect of Integrated Circuits
- The CITES
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“It is accordance with our determination to refrain from aggression and build up a sentiment and practice among nations more favorable to peace ... that we have incurred the consent of fourteen important nations to the negotiation of a treaty condemning recourse to war, renouncing it as an instrument of national policy.”
—Calvin Coolidge (18721933)