Gustav Martinsen (5 November 1843 – 19 March 1920) was a Norwegian industrial leader and politician for the Conservative Party.
He was born in Drammen to merchant Martin Christophersen and Oline Gulbrandsen, and was the father of Haavard Martinsen.
He founded the mill Bjølsen Valsemølle in 1884, and initiated and chaired Norsk Mølleforening.
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