Nils Claus Ihlen (24 July 1855 – 22 March 1925) was a Norwegian engineer and politician for the Liberal Party. He served as Foreign Minister of Norway from 1913 to 1920.
Early life
He was born in Skedsmo as the oldest son of Wincentz Thurmann Ihlen (1826–1892) and Birgitte Elisabeth Mørch (1830–1913). He was a first cousin of Christian Ihlen, nephew of Niels Ihlen and of Jacob Thurmann Ihlen, great-grandson of the constitutional founding father Ole Clausen Mørch and brother-in-law of Per Lund.
In August 1892, he was married to actress Constance Bruun, but she died in October 1894. In February 1898, he married a colonel's daughter, Henriette Marie Lund (1870–1962). The couple had several daughters and sons. The sons Nils, Joakim and Alf (Nils was the half-brother of the other two) took over the family business.