Wilhelm Christian Ottesen Keilhau (30 July 1888 – 9 June 1954) was a Norwegian historian and economist.

He was married twice, first to Rachel Greiner in 1915, and second time to Rita Wilhelma Steensrud.

He was CEO of Norway's first airline company, Det norske Luftfartsrederi, in 1918.

During World War II he was a member of the board of directors of the London department of Norges Bank.

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