Sigbjørn Mustad (19 April 1897 – 30 October 1970) was a Norwegian lawyer and politician for the Conservative Party.
During the German occupation of Norway he was assigned with the Norwegian governmental administration in London.
From 1946, he was appointed presiding judge in Agder Court of Appeal.
He published the book Utenlands i krigsårene in 1958, and Union i 17 år.
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