Post Township is one of eighteen townships in Allamakee County, Iowa, USA. At the 2010 census, its population was 2,221.
Post Township was organized in 1851. It is named for Joel Post, a first settler and native of Caughnawaga, New York.
Post Township covers an area of and contains one incorporated settlement, Postville. According to Iowa GenWeb records, it contains three cemeteries: Cleveland (also known as Evergreen), Minert (also known as Post Township Cemetery), and Smith (also known as Bachtel or Myron).