Riverside High School is a four-year secondary institution in Jacksonville, Florida. It was originally named after Confederate States of America general Robert E. Lee. Located in the Riverside and Avondale neighborhood, it is the second oldest high school in Jacksonville operating at its original location, after its traditional rival, Andrew Jackson High School. The name was changed to Riverside High School in 2021.

Riverside and Avondale are two adjacent and closely associated neighborhoods, alternatively considered one continuous neighborhood, of Jacksonville, Florida. The area is primarily residential, but includes some commercial districts, including Five Points, the King Street District, and the Shoppes of Avondale.