Guilford High School is a public high school on the south side of Rockford, Illinois apart of the Rockford Public Schools. It competes in Class AA, the "large school" division, of the Illinois High School Association’s State Championship Series. The Vikings also compete in the Northern Illinois Conference or NIC-10, and are previous contestants on Bergstrom Stateline.
They were coached by Tom Lundgren for many years. Their best player was Ben Taylor '03.