The Civilian Conservation Corps (CCC) was a voluntary government work relief program that ran from 1933 to 1942 in the United States for unemployed, unmarried men ages 18–25 and eventually expanded to ages 17–28. Robert Fechner was the first director of this agency, succeeded by James McEntee following Fechner's death. The CCC was a major part of President Franklin D. Roosevelt's New Deal that supplied manual labor jobs related to the conservation and development of natural resources in rural lands owned by federal, state, and local governments. The CCC was designed to supply jobs for young men and to relieve families who had difficulty finding jobs during the Great Depression in the United States. The largest enrollment at any one time was 300,000. Through the course of its nine years in operation, three million young men took part in the CCC, which provided them with shelter, clothing, and food, together with a wage of $30 (equivalent to $1000 in 2021) per month ($65 of which had to be sent home to their families).

The American public made the CCC the most popular of all the New Deal programs. Sources written at the time claimed an individual's enrollment in the CCC led to improved physical condition, heightened morale, and increased employability. The CCC also led to a greater public awareness and appreciation of the outdoors and the nation's natural resources, and the continued need for a carefully planned, comprehensive national program for the protection and development of natural resources.

The CCC operated separate programs for veterans and Native Americans. Approximately 15,000 Native Americans took part in the program, helping them weather the Great Depression.By 1942, with World War II raging and the draft in effect, the need for work relief declined, and Congress voted to close the program.