Grove Township is one of twelve townships in Humboldt County, Iowa, United States.

[2] According to the United States Census Bureau, Grove Township covers an area of 36.3 square miles (94 km2); 36.2 square miles (94 km2) of this is land, and the remaining 0.1 square miles (0.26 km2) is water.

A community named Randolph contained a post office from 1874 to 1875.

A post office also existed for the community Arnold, formerly Grove, from 1900 to 1929.

Both of these historic communities were located in the northwest corner of Grove Township.