Per August Leonard Hallström (29 September 1866 – 18 February 1960) was a Swedish author, short-story writer, dramatist, poet and member of the Swedish Academy. He joined the academy in 1908, and served as its Permanent Secretary from 1931 to 1941.^[1]

Before devoting himself to writing, Hallström worked in London and Chicago as a chemist. He is appreciated primarily for his collections of short stories, such as Purpur [Purple] (1895) and Thanatos [Death] (1900). His major works, written before 1910, combine profound compassion with a sensitive awareness of beauty.^{[citation needed]} Between 1922 and 1946, Hallström served as Chairman of the Nobel Committee of the Swedish Academy for the Nobel Prize in Literature.

Per was grandfather to Anders Hallström, who was also a writer.

"The Falcon" (April 1950), in Argosy, Australia/New Zealand edition