Illyria Township is one of twenty townships in Fayette County, Iowa, United States. As of the 2010 census, its population was 532.

According to the United States Census Bureau, Illyria Township covers an area of 36.86 square miles (95.45 square kilometers); of this, 36.85 square miles (95.44 square kilometers, 99.99 percent) is land and 0.01 square miles (0.01 square kilometers, 0.01 percent) is water.

• Wadena

• Illyria at 42°53′55″N 91°38′07″W / 42.898593°N 91.635152°W / 42.898593; -91.635152

(This list is based on USGS data and may include former settlements.)

• Pleasant Valley Township (north)
• Marion Township, Clayton County (northeast)
• Highland Township, Clayton County (east)
• Sperry Township, Clayton County (southeast)
• Fairfield Township (south)
• Smithfield Township (southwest)
• Westfield Township (west)
• Union Township (northwest)

The township contains these three cemeteries: Illyria-Highland, Saint Josephs and Wadena.

• Iowa Highway 56

• North Fayette Valley Community School District

• Iowa's 1st congressional district
• State House District 24
• State Senate District 12

• United States Census Bureau 2008 TIGER/Line Shapefiles
• United States Board on Geographic Names (GNIS)
• United States National Atlas

• US-Counties.com
• City-Data.com