Hjalmar Krag (2 July 1867 – 25 April 1954) was a Norwegian military officer, businessman and sports official.

Krag was born in Vestre Aker to director of the Norwegian Directorate of Public Roads, Hans Hagerup Krag, and Anna Marie Pedersen.

He served as adjutant to Haakon VII of Norway from 1905 to 1908.

He was decorated Knight, First Class of the Order of St. Olav in 1935.

This biographical article related to the Norwegian military is a stub.