The Academy of Richmond County is a high school located in Augusta, Georgia, United States. Known previously as Richmond County Military Academy, it is commonly known as Richmond Academy or ARC.

Chartered in 1783, it is listed as the fifth oldest existing public high school in the United States, and the oldest existing public high school in the Southern United States.

Richmond Academy is located at the edge of the Summerville historic district of Augusta.

Initially an all-male private school, as were most of the high schools in the 1700s, after the Civil War it was adapted as a military school. During the last half of the 20th century, Richmond Academy transitioned into a co-educational, traditional public high school. It has maintained a strong military Junior Reserve Officer Training Corps that is available, but not mandatory, for participation by students. Both the 1857, and the present 1926, Richmond Academy buildings are listed on the National Register of Historic Places.

President George Washington delivered the commencement address at the graduation ceremonies at ARC in 1791.

In 1926, the academy moved to its present-day building on Walton Way. Principal Major George Butler described the school in 1927 as "second to none in the South in terms of facility." The 1926 building was designed in Gothic-style architecture.

Up until the 1950s, ARC was for white males only. The 1951–1957 Richmond Academy boys' baseball team was ranked as one of the top 10 Georgia state sports dynasties. It has teams in many sports.

During the 1950s the school became coeducational, admitting female students. In 1964, the school began to admit minorities and became desegregated.