Nikolai Ramm Østgaard, sometimes referred to as N. R. Østgaard (30 October 1885 – 20 June 1958) was a Norwegian military officer, aide-de-camp for Olav V of Norway, and sports official who is best known as Presidentof the International Ski Federation (FIS) from 1934 to 1951.
He was born in Kristiania as a son of merchant Einar Østgaard (1857–1907) and Karen Betzy Bredesen (1858–1938), and grandson of the writer Nikolai Ramm Østgaard. In July 1916 he married Ragni Gullichsen (1894–1956). One of their daughters married Erling Welle-Strand. He was the father of architect Rolf Ramm Østgaard.
He finished his secondary education in 1904 and graduated as a premier lieutenant from the Norwegian Military Academy in 1908. From 1908 to 1913 he taught physical education and mathematics in Kristiania, while he spent several winters as a ski coach in Central Europe.
In 1914 he became the personal trainer of Crown Prince Olav of Norway, by recommendation of his employer at school, Sigurd Halling. Østgaard was promoted to aide-de-camp for the Crown Prince in 1924, from the 1930s also with the administrative responsibility for the farm Skaugum. Also, his wife became mistress of the robes for the Crown Princess.
Østgaard was himself an able ski jumper and Nordic combined skier, and won three Norwegian football cups with his club SFK Lyn in 1908, 1910 and 1911. He chaired SFK Lyn from 1911 to 1912, and also Kristiania Skiing District Association (1909–1910) and the Norwegian Ski Federation (1927–1930). While serving in the latter position he became vice president of the International Ski Federation (1928–1934), later serving as president from 1934 to 1951. He was proclaimed honorary president upon backing down.