Black Diamond is a census-designated place (CDP) in Citrus County, Florida, United States.

Black Diamond is located north of the geographic center of Citrus County at 28°54′40″N 82°29′33″W / 28.91111°N 82.49250°W / 28.91111; -82.49250 (28.911262, -82.492608).

County Road 491 (North Lecanto Highway) forms the eastern edge of the CDP, leading northeast 5 miles (8 km) to U.S. Route 41 and south 4 miles (6 km) to State Road 44 in Lecanto.

According to the United States Census Bureau, the CDP has a total area of 3.9 square miles (10.2 km2), all land.

The racial makeup of the CDP was 94.09% White, 0.72% African American, 4.61% Asian, and 0.58% from two or more races.