| Gmina Grunwald | |
| Other Name: | Grunwald Commune |
| Settlement Type: | Gmina |
| Total Type: | Total |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Warmian-Masurian |
| Subdivision Type2: | County |
| Subdivision Name2: | Ostróda |
| Coor Pinpoint: | Gierzwałd |
| Coordinates: | 53.55°N 25°W |
| Area Total Km2: | 179.84 |
| Population Total: | 5648 |
| Population As Of: | 2006 |
| Population Density Km2: | auto |
| Seat: | Gierzwałd |
Gmina Grunwald is a rural gmina (administrative district) in Ostróda County, Warmian-Masurian Voivodeship, in northern Poland.
Gmina Grunwald is divided into 19 sołectwos. The villages with the largest population are Gierzwałd, which dates back to the 14th century, and Zybułtowo. Gierzwałd is the administrative seat of the gmina. Unusually the gmina is not named after the seat, but takes its name from the smaller village of Grunwald, because of the historical importance of the Battle of Grunwald of 1410.The gmina covers an area of 179.84km2 (agricultural land 72%, forest 18%), and as of 2006 its total population is 5,648.
Gmina Grunwald includes the villages and settlements of Dąbrowo, Domkowo, Dylewko, Dylewo, Frygnowo, Gierzwałd, Glądy, Góry Lubiańskie, Grabiczki, Grunwald, Jędrychowo, Kalwa, Kiersztanówko, Kiersztanowo, Kitnowo, Łącko, Lipowa Góra, Łodwigowo, Lubian, Lubianek, Marcinkowo, Mielno, Omin, Pacółtówko, Pacółtowo, Rychnowo, Rychnowska Wola, Rzepki, Stębark, Szczepankowo, Tymawa, Ulnowo, Wróble, Zapieka and Zybułtowo.
Gmina Grunwald is bordered by the gminas of Dąbrówno, Kozłowo, Olsztynek and Ostróda.
It contains several lakes, the largest of which are Jezioro Tymawskie, Jezioro Lubień, Jezioro Mielno, Jezioro Wielki Omin and Jezioro Mały Omin.
Natural monuments and nature reserves: