The California Department of Conservation is a department within the government of California, belonging to the California Natural Resources Agency. With a team of scientists, engineers, environmental experts, and other specialists, the Department of Conservation administers a variety of programs vital to California's public safety, environment and economy. The department's mission is to manage California's working lands. It regulates oil, natural gas and geothermal wells; studies and maps earthquakes and other geologic phenomena; maps and classifies areas containing mineral deposits; ensures reclamation of land used for mining; and administers agricultural and open-space land conservation programs. A division within the department dedicated to encouraging beverage container recycling has been moved into the newly created Department of Resources Recovery and Recycling (CalRecycle). Despite the similar name, the Department of Conservation should not be confused with the California Conservation Corps, another department within the Natural Resources Agency, which provides work experience for young adults. The Department of Conservation often collaborates with its federal equivalents, such as the U.S. Geological Survey.

The department's director is David Shabazian.