Sohlberg attended the Royal School of Art and Design of Christiania. He later trained under the graphic artist and painter Johan Nordhagen. Sohlberg attended the art school of Kristian Zahrtmann. He also studied as a pupil of Erik Werenskiold, Eilif Peterssen and Harriet Backer.
He is particularly known for his depictions of the mountains of Rondane and the town of Røros. Perhaps his most widely-recognized paintings, in several variations, is Winter's Night in Rondane, presently featured at the National Gallery (Nasjonalgalleriet). 
His painting Fisherman's Cottage was used as the cover of a book by John Burnside called A Summer of Drowning; Sohlberg is mentioned prominently throughout the novel, and one of the sections of this book is called "The Fisherman's House" in obvious homage to the painting. Another painting, Flower Meadow of the North was used as the cover of the book Morning Poems by Robert Bly.  
- Natteglød (1893) Nasjonalgalleriet, Oslo.
- Sommernatt (1899) Nasjonalgalleriet, Oslo.
- Vinternatt i fjelene (1901) Hilmar Rekstens Samlinger, Bergen
- Fra Røros (1902) Nasjonalgalleriet, Oslo.
- Natt (1904) Trondheim Kunstmuseum, Trondheim
- En blomstereng nordpå (1906) Nasjonalgalleriet, Oslo.
- Eken (1908) Drammen Kunstmuseum
- Vinternatt i Rondane (1911–14) Nasjonalgalleriet, Oslo.
- Harald Sohlberg ((Bergstaden Røros og Kobberverket)
- Sohlberg, Harald (Web Gallery of Art
- Harald Sohlberg (Norsk Biografisk Leksikon)
- Harald Sohlberg (Store norske leksikon)
- A Summer of Drowning (John Burnside, author. Vintage Books. 2012) ISBN 978-0099422372
- Morning Poems (Robert Bly author. Harper Perennial. 1998) ISBN 978-0060928735
- Bjerke, Øivind Storm (1991) Harald Sohlberg: Ensomhetens maler (Gyldendal norsk forlag) ISBN 978-8205202122
- Bjerke, Øivind Storm (1996) Edvard Munch and Harald Sohlberg: Landscapes of the Mind (National Academy of Design) ISBN 978-1887149013
- Lange, Marit Ingeborg, Peter Norgaard Larsen (2003) Nordiske Stemninger: Harald Sohlberg. L.A. Ring (Stiftelsen) ISBN 978-8290734324
- Harald Oskar Sohlberg (PaintingSTAR.com)
- Harald Sohlberg (Fineart AS)
- Harald Oskar Sohlberg (EIL Art Store)
- Winter Night in Rondane (Images of Norway: Rondane and Harald Sohlberg)
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