Karpentná (Polish: Karpętna) is a village in Frýdek-Místek District, Moravian-Silesian Region, Czech Republic. It was a separate municipality but became administratively a part of Třinec in 1980. It lies in the historical region of Cieszyn Silesia and has a population of 705 (1 January 2008).
The name is of topographic origins derived from Old Polish verb karpić się or noun karpaty denoting a ground that is lumpy, scabrous, in souther Poland adjective karpętny describes uneven, bumpy road.
Popular folk song in the regional dialect Na Karpyntnej zdechnył kóń (A Horse Died in Karpętna) refers to the village.
The village was first mentioned in 1552. It belonged then to the Duchy of Teschen, a fee of the Kingdom of Bohemia and a part of the Habsburg Monarchy.