Diamond is a village in Grundy and Will Counties, Illinois. The population was 2,527 at the 2010 census. Terry Kernc is the current mayor of Diamond.
Diamond is located at 41°17′16″N 88°15′14″W / 41.28778°N 88.25389°W / 41.28778; -88.25389 (41.287699, -88.253824).
According to the United States Census Bureau, the village has a total area of 1.6 square miles (4.1 km²), all of it land.