Gustaf Gabriel Roland af Hällström (23 August 1905 – 21 February 1956) was a Finnish film director.
During his career, he directed 20 films, including Pikajuna pohjoiseen (1947), Läpi usvan (1948), Tukkijoella (1951), Noita palaa elämään (1952), Putkinotko (1954) and Ryysyrannan Jooseppi (1955).Hällström was married to actress Elvi Saarnio.
As a screenwriter, he used a pseudonym Viljo Hela.
Author: Unknown, before 1965 Source: Suomalaisen elokuvan vuosikymmenet : johdatus kotimaisen elokuvan ja elokuva-alan historiaan 1896-1963 / Kari Uusitalo, Helsinki : Otava, 1965, picture gallery of Finnish film makers License: PD Finland (simple photos)