Treaty of Washington
- Arkansas Territory
- CITES
- International Meridian Conference
- Iowa people
- Meskwaki
- Muscogee
- North Atlantic Treaty
- Oregon Treaty
- Sauk people
- Treaty of Washington (1826)
- Treaty of Washington (1836)
- Treaty of Washington (1855)
- Treaty of Washington (1871)
- Treaty of Washington (1900)
- Treaty of Washington, with Menominee (1831)
- Washington Naval Treaty
- Webster–Ashburton Treaty