Marius Cathrinus Backer (25 June 1866  – 19 February 1960) was a Norwegian judge.

He was born in Drammen to timber trader Lars Zacharias Backer and Hanna Schwartz. He graduated as cand.jur. in 1888, and was named as a Supreme Court Justice from 1911 to 1936. He was decorated Knight, First Class of the Order of St. Olav in 1929.

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