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Klaus Hanssen (23 May 1844 – 1914) was a Norwegian physician and politician for the Liberal Party and the Coalition Party.He served as a deputy representative to the Norwegian Parliament during the terms 1889–1891 representing the constituency Bergen. He was a member of Bergen city council for several years and served as mayor in 1894. He later joined the Coalition Party and served as a parliamentary deputy again during the term 1904–1906.Born in Bergen he graduated as cand.med.