Blaine Township is a township in Clay County, Kansas, United States. As of the 2020 census, its population was 214.
Blaine Township covers an area of and contains no incorporated settlements. According to the USGS, it contains two cemeteries: Republican City and Wilson.
The streams of Chestnut Branch, Huntress Creek, North Branch Five Creek, Otter Creek and Reeder Branch Five Creek run through this township.