Washington Treaty

The Treaty of Washington may refer to

• Treaty of Washington of 1836, a U.S.-Native American treaty
• The Treaty of Washington of 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 North Atlantic Treaty of 1949 that created NATO