Gmina Siemkowice is a rural gmina (administrative district) in Pajęczno County, Łódź Voivodeship, in central Poland. Its seat is the village of Siemkowice, which lies approximately 9 kilometres (6 mi) north-west of Pajęczno and 76 km (47 mi) south-west of the regional capital Łódź.

The gmina covers an area of 97.4 square kilometres (37.6 sq mi), and as of 2006 its total population is 5,016.

Gmina Siemkowice contains the villages and settlements of Borki, Bugaj Radoszewicki, Delfina, Ignaców, Katarzynopole, Kije, Kolonia Lipnik, Laski, Lipnik, Łukomierz, Mazaniec, Miętno, Mokre, Ożegów, Pieńki Laskowskie, Radoszewice, Siemkowice and Zmyślona.

Gmina Siemkowice is bordered by the gminas of Działoszyn, Kiełczygłów, Osjaków, Pajęczno and Wierzchlas.

• Polish official population figures 2006