Twin Lake Township is one of sixteen townships in Hancock County, Iowa, USA.

As of the 2000 census, its population was 197.

[1] Twin Lake Township was organized in 1882.

[2] It was named from two lakes in the southern part of the township.

[3] According to the United States Census Bureau, Twin Lake Township covers an area of 35.77 square miles (92.64 square kilometers); of this, 35.32 square miles (91.48 square kilometers, 98.75 percent) is land and 0.45 square miles (1.16 square kilometers, 1.25 percent) is water.