International Women's Day marches in Mexico become violent with 62 police officers and 19 civilians injured in Mexico City alone.

International Women's Day (IWD) is celebrated on 8 March, commemorating women's fight for equality and liberation along with the women's rights movement. International Women's Day gives focus to issues such as gender equality, reproductive rights, and violence and abuse against women. Spurred by the universal female suffrage movement, International Women's Day originated from labor movements in Europe and North America during the early 20th century.

This article lists events occurring in Mexico during the year 2021. The article lists the most important political leaders during the year at both federal and state levels and will include a brief year-end summary of major social and economic issues. Cultural events, including major sporting events, are also listed. For a more expansive list of political events, see 2021 in Mexican politics and government.

Mexico City is the capital and largest city of Mexico, as well as the most populous city in North America. It is one of the most important cultural and financial centers in the world, and is classified as an Alpha world city according to the Globalization and World Cities Research Network (GaWC) 2024 ranking. Mexico City is located in the Valley of Mexico within the high Mexican central plateau, at an altitude of 2,240 meters (7,350 ft). The city has 16 boroughs or demarcaciones territoriales, which are in turn divided into neighborhoods or colonias.

March 8 is the 67th day of the year in the Gregorian calendar; 298 days remain until the end of the year.