This category is for treaties that entered into legal force in the year 1921. For treaties that were written and opened for signature in 1921, see Category:Treaties concluded in 1921.
| Treaties by year of entry into force: | 1916 • 1917 • 1918 • 1919 • 1920 • 1921 • 1922 • 1923 • 1924 • 1925 • 1926 |
All items (8)