Plenna [ˈplɛnna] is a village in the administrative district of Gmina Radoszyce, within Końskie County, Świętokrzyskie Voivodeship, in south-central Poland. It lies approximately 3 kilometres (2 mi) north-east of Radoszyce, 16 km (10 mi) south-west of Końskie, and 33 km (21 mi) north-west of the regional capital Kielce.