partido (county), at the southeastern limits of Gran (Greater) Buenos Aires, eastern Argentina, in Buenos Aires provincia (province). Founded as the town of San Juan in 1873, Florencio Varela was declared a city in 1953. The county was established in 1893 out of the existing counties of Quilmes, San Vicente, and Almirante Brown.

With the growth of the national capital, Florencio Varela has been absorbed into the southeastern suburban area of Gran Buenos Aires. Less than half of it lies within the Gran Buenos Aires urban area, and its population density is lower than most of the other counties in Gran Buenos Aires. Railway service and the national highway system connect the county to Buenos Aires. Pop. (2001) 341,507.