The Hooker County Courthouse, located on Cleveland Ave. between Railroad and 1st Sts. in Mullen, Nebraska, is a courthouse building of Hooker County, Nebraska. It was built in 1912. It was a work of Grand Island architect Oscar R. Kirschke.It was listed on the National Register of Historic Places in 1990. It was deemed significant as a good example of the "County Citadel" type of courthouse.