Karl Gustaf Magnus Sjöberg (26 September 1927 – 29 December 2024) was a Swedish jurist.
Sjöberg served as an extra legal clerk (fiskal) in the Svea Court of Appeal in 1956 and tingsrätt secretary in the Nedansiljan Judicial District from 1957 to 1959.
Sjöberg was an expert at the Ministry of Justice from 1965 to 1967, and served as acting deputy director-general (departementsråd) in the Prime Minister's Office (Statsrådsberedningen) in 1967.
Sjöberg served as President of the Supreme Administrative Court of Sweden from 1990 to 1994.
Sjöberg became an honorary member of the Gotlands nation at Uppsala University in 1988.