Stieg Ivar Trenter (14 August 1914 – 4 July 1967) was a Swedish journalist and popular crime writer.

Born Stig Johansson in Stockholm, he started out by using the name Stieg Trenter as pseudonym but soon changed his name to this in real life as well.

His first novel was Ingen kan hejda döden ("No One Can Stop Death"), published in 1943.

The main characters in many of his books are crime investigating press photographer Harry Friberg and his crime solving partner Detective Inspector Vesper Johnson.

These books are his most famous but he also published other independent crime novels.