Duplica (pronounced [duˈpliːtsa], German: Duplitza[3]) is a former settlement in the Municipality of Kamnik in central Slovenia.

[4][5] The name is believed to derive from a diminutive of the common noun *dupľь 'hollow, cavity', referring to a place where there were hollows or pits in the terrain.

[5] During construction of the Kamnik Railway in 1890, Roman graves were discovered in Duplica, testifying to its early settlement.

[1] Duplica originally had an agricultural character, but it developed into an industrial suburb of Kamnik between the two world wars, with a large furniture factory.

During the Second World War, Partisan activity damaged the bridge across the Kamnik Bistrica, the furniture factory, and telephone lines in Duplica in 1941.