Hjalmar Karl Emil Dahl (15 May 1891 – 19 October 1960) was a Swedish-speaking Finnish journalist, translator and author.
Hjalmar Dahl was born in Parikkala to pharmacist Johan Dahl (1861–1908) and Betty Kiljander (1865–1927). After graduating in Helsinki in 1910, he moved to the University of Lausanne, where he graduated in 1913. After returning to Finland, he began his almost 30-year career as a journalist in the Russian-language department of Hufvudstadsbladet, in addition to which he was editor-in-chief of Nya Tidningen from 1922 to 1925. He was also the editor-in-chief of Helsingfors-Journalen from 1929 to 1944, the editor of Månads-Revyn from 1940 to 1944 and the editor-in-chief of Aftonposten from 1944 to 1945.
His debut work was Erik Åmark's Anxieties (1931).
Dahl was the executive director of the Artists' Association of Finland from 1923 to 1926, and from 1945 Dahl was a freelance writer. Dahl translated many Russian literary classics as well as works by F. E. Sillanpää into Swedish.
From 1955, Dahl lived in Porvoo, where he died on October 19, 1960. He was buried in Näsinmäki Cemetery.
Erik Åmarks oro. Schildts, 1931
Herrarna till Kaukola. Schildts, 1941
Helsingfors – det havsomflutna. Schildts, 1949
Finlands svenskar : upplagsverk. Söderström, 1956
"Dahl, Hjalmar Karl Emil". Writers in Finland 1917–1944 (in Finnish). Helsinki: Suomalaisen Kirjallisuuden Seura och Svenska litteratursällskapet i Finland. 1981. pp. 46–47. ISBN 951-717-238-9.