Garden Grove Township is a township in Decatur County, Iowa, United States. As of the 2000 census, its population was 428.
Garden Grove Township was created in 1850.
Garden Grove Township covers an area of ; of this, or 0.12 percent is water. The streams of Mormon Pool and Weldon Creek run through this township.
The township contains five cemeteries: Doze, Garden Grove, Metier, Morman and Winters.