Iowa Highway 26 is a 11-mile-long (18 km) state highway that runs from south to north in Allamakee County, Iowa. It begins in Lansing at an intersection with Iowa Highway 9 at the Black Hawk Bridge and ends at the Minnesota border at New Albin. It continues into Minnesota as Minnesota State Highway 26. Iowa 26 was created in 1969 in a numbering swap with Iowa Highway 182. The designation was changed to match TH 26. The highway is the northernmost leg of the Great River Road in Iowa. Most of the highway is designated the Driftless Area Scenic Byway.

Allamakee County is the northeasternmost county in the U.S. state of Iowa. As of the 2020 census, the population was 14,061. Its county seat is Waukon.