Gerald Douglas "Bo" Huff (March 12, 1943 – August 4, 2015) was an American custom car designer and an influential figure in the American Kustom Kulture and hot rod movement. He was known as the "Rockabilly King" in the American custom car scene for his promotion of Kustom Kulture lifestyle, rat rods, and custom cars, and was identified as one of the top 20th and early 21st century American custom car designers.