Wilhelm August Fleckhaus (21 December 1925 – 12 September 1983) was a German designer and art director, perhaps best known as art director of Twen magazine throughout its 1959 to 1970 existence. He was a prolific designer of book covers.
Fleckhaus was born in 1925 in Velbert, Germany.
He died of a heart attack at his home in Tuscany, Italy on 12 September 1983.