This timeline of women in warfare and the military (1900–1945) deals with the role of women in the military around the world from 1900 through 1945.
The two major events in this time period were World War I and World War II.
Please see Women in World War I and Women in World War II for more information.
For articles specifically pertaining to the United States, see: Timeline of women in war in the United States, pre-1945 and Timeline of women in warfare in the United States from 1900 to 1949.