Deputy is an unincorporated community and census-designated place (CDP) in Graham Township, Jefferson County, Indiana, United States. By road it is approximately 18 miles (29 km) northwest of Madison, the county seat. As of the 2010 census it had a population of 86.
Deputy is located in western Jefferson County at 38°47′39″N 85°39′12″W, northwest of the center of Graham Township. Indiana State Road 3 forms the eastern edge of the community; the highway leads north 16 miles (26 km) to North Vernon and south 40 miles (64 km) to Jeffersonville.
According to the U.S. Census Bureau, the Deputy CDP has an area of 0.073 square miles (0.19 km2), all of it recorded as land. Lewis Creek flows northward just east of the community, leading in 1 mile (1.6 km) to the Muscatatuck River, part of the White River watershed.
Deputy is located on land that is considered to be of karst topography. The town and the area around it contain numerous sink holes and caves.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Deputy has a humid subtropical climate, abbreviated "Cfa" on climate maps.
Primarily an agricultural community, Deputy residents farm timber, corn, soybeans, wheat, hay, tobacco as well as vegetables and fruits in season.