Larrabee County was a proposed county to be formed out of the northern part of Kossuth County, Iowa, United States. The county was to be named after governor William Larrabee. Bancroft County had existed in the area for several years in the 1850s, but was disestablished. An attempt to recreate the county out of roughly the same area had taken place in the early 1870s with Crocker County, but its establishment was ruled to be unconstitutional due to being too small in area. In November 1914, a referendum was held in Kossuth County in order to propose the existence of Larrabee County, and voters rejected the county's creation. As such, Kossuth County remained the largest county in Iowa.