Karenus Kristofer Thinn (19 December 1850 – 24 March 1942) was a Norwegian judge.
From 1891 he was a presiding judge (lagmann) in Hålogaland, Borgarting and Agder.
In 1902 he was appointed extraordinary Supreme Court assessor.
From 1909 to 1920 he served as its tenth Chief Justice.
[1] This Norwegian law-related biographical article is a stub.