César Estrada Chávez (; March 31, 1927 – April 23, 1993) was an American farm worker, labor leader, and civil rights activist who, with Dolores Huerta, co-founded the National Farm Workers Association, which later became the United Farm Workers (UFW).
A Mexican American, Chávez became the best known Latino American civil rights activist, and was strongly promoted by the American labor movement, which was eager to enroll Hispanic members. His public-relations approach to unionism and aggressive but nonviolent tactics made the farm workers' struggle a moral cause with nationwide support. By the late 1970s, his tactics had forced growers to recognize the UFW as the bargaining agent for 50,000 field workers in California and Florida. However, by the mid-1980s membership in the UFW had dwindled to around 15,000.
After his death he became a major historical icon for the Latino community, and for liberals generally, symbolizing support for workers and for Hispanic power based on grass roots organizing and his slogan "Sí, se puede" (Spanish for "Yes, it is possible" or, roughly, "Yes, it can be done"). His supporters say his work led to numerous improvements for union laborers. His birthday, March 31, has become César Chávez Day, a state holiday in three US states. Many parks, cultural centers, libraries, schools, and streets have been named in his honor in cities across the United States.