Erling Viksjø (4 July 1910 – 2 December 1971) was a Norwegian architect. Viskjø was an early exponent of architectural modernism. He was also noted for his use of textured concrete as a building material in a number of his designs. 
Viksjø was born in Trondheim, Norway. He studied architecture at the Norwegian Institute of Technology (Norges tekniske høgskole) until 1935. He then moved to Oslo where he joined the firm of architect Ove Bang. During World War II, he led the architectural firm following the death of Bang death in 1942. During the occupation of Norway by Nazi Germany Viksjø was imprisoned in Grini concentration camp from April 1944 to the war's end in May 1945. After the war he started his own architectural office.
Among his designs are Bakkehaugen Church (Bakkehaugen kirke) in Oslo and Tromsø Bridge (Tromsøbrua) in Tromsø. He earned the architecture and civil engineering award Betongtavlen in 1961 for Bakkehaugen Church and 1963 for Tromsø Bridge.  
Viksjø is particularly known for his natural concrete treatment which was patented as Naturbetong. In 1950, he was co-inventor (together with civil engineer Sverre Jystad) of this method of casting and machining concrete to achieve special surface effects in facades. A number of Viksjø designed buildings are listed with natural concrete including the high-rise government block in Oslo (Regjeringskvartalet), Bergen City Hall (Bergen rådhus) as well as headquarter buildings of Norsk Hydro in Bygdøy and Standard Telefon og Kabelfabrik. 
- Regjeringsbygningen in Oslo, 1946–59
- Fisheries School in Honningsvåg, 1950-56
- Marmorberget housing company in Oslo, 1952-54
- Hangars at Bodø and Ørland main flight station, 1952-56
- Nordnorsk student home in Oslo, 1953-60
- Bakkehaugen Church in Oslo, 1955-59
- Oslo Health Council in Oslo, 1956-69
- Y-Block in the Government Quarter in Oslo, 1956-70
- Channel Bridge in Tønsberg, 1957
- Nordseter fjellkirke at Lillehammer, 1958-64
- Norsk Hydro administration building in Oslo, 1960-63
- Elkemhuset, Middelthuns in Oslo, 1960-65
- Tromsøbrua in Tromsø, 1963
- Cinema and samlingen at Lillehammer, 1963
- Standard Telefon og Kabelfabrik in Oslo, 1968
- Bergen City Hall in Bergen, 1968-74
- Trond Marinus Indahl. "Erling Viksjø". Norsk kunstnerleksikon. Retrieved December 1, 2017.
- "Erling Viksjø (1910-1971)". danish design review. Retrieved December 1, 2017.
- Ottosen, Kristian, ed. (1995). Nordmenn i fangenskap 1940–1945 (in Norwegian) (1st ed.). Oslo: Universitetsforlaget. p. 651. ISBN 82-15-00288-9.
- Dag Myklebust. "Ove Bang". Norsk kunstnerleksikon. Retrieved December 1, 2017.
- "Betongtavlen". Norske arkitekters landsforbund. Retrieved December 1, 2017.
- "Bakkehaugen kirke". Norske Kirkebygg. Retrieved December 1, 2017.
- "Tromsøbrua". Architecture Guide for Northern Norway and Svalbard. Retrieved December 1, 2017.
- Trohaug, Hallvard. "Erling Viksjø". In Helle, Knut (ed.). Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 10 November 2012.
- Godal, Anne Marit (ed.). "Erling Viksjø". Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 10 November 2012.
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