Women's History Month is an annual designated month that shines a spotlight on the contributions of women to historical events and contemporary society. Celebrated in March in the United States, the United Kingdom, and Australia, it aligns with International Women's Day on March 8. In Canada, the observance takes place in October, coinciding with Persons Day on October 18.

The commemoration originated in 1978 as "Women's History Day" in Sonoma County, California. Advocated by Gerda Lerner and the National Women's History Alliance, it evolved from a local day of recognition to a national week in 1980 and eventually became a month-long celebration in the United States in 1987. Its influence expanded globally in subsequent years.