Gmina Gruta is a rural gmina (administrative district) in Grudziądz County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. Its seat is the village of Gruta, which is approximately 13 kilometres (8 mi) east of Grudziądz and 52 km (32 mi) north-east of Toruń.

The gmina covers an area of 123.77 square kilometres (47.8 sq mi) and, in 2006, its total population was 6,539.

Gmina Gruta contains the villages and settlements of Annowo, Boguszewo, Dąbrówka Królewska, Gołębiewko, Gruta, Jasiewo, Kitnowo, Mełno, Mełno-Cukrownia, Nicwałd, Okonin, Orle, Plemięta, Pokrzywno, Salno, Słup and Wiktorowo.

Gmina Gruta is bordered by the gminas of Grudziądz, Łasin, Radzyń Chełmiński, Rogóźno and Świecie nad Osą.

• Polish official population figures 2006