Per Waldemar Hammenhög (18 April 1902 – 1 November 1972) was a Swedish writer and novelist. The trivial, petty bourgeois urban environment forms the basis of many of his early realistic novels, whereas his later works turned towards religious and moral issues. Writing more than 40 novels, Hammenhög is probably best known for Pettersson & Bendel (1931), a humorous novel adapted twice to screen.