Gmina Radomin is a rural gmina (administrative district) in Golub-Dobrzyń County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. Its seat is the village of Radomin, which lies approximately 10 kilometres (6 mi) east of Golub-Dobrzyń and 40 km (25 mi) east of Toruń.

The gmina covers an area of 80.77 square kilometres (31.2 sq mi), and as of 2006 its total population is 4,104.

Gmina Radomin contains the villages and settlements of Bocheniec, Dulsk, Dulsk-Frankowo, Gaj, Jakubkowo, Kamionka, Łubki, Piórkowo, Płonko, Płonne, Radomin, Rętwiny, Rodzone, Spiczyny, Szafarnia, Szczutowo, Wilczewko and Wilczewo.

Gmina Radomin is bordered by the gminas of Brzuze, Golub-Dobrzyń, Wąpielsk and Zbójno.

• Polish official population figures 2006