Klaus Berntsen, Danish politician, Prime Minister of Denmark (born 1844)

Klaus Berntsen was a Danish politician, representing the Liberal party, Venstre. He was Council President of Denmark from 1910 to 1913. He served as minister of defence from 1910 to 1913 and again from 1920 to 1922. He was also minister of the interior from 1908 to 1909.

The prime minister of Denmark is the head of government in the Kingdom of Denmark comprising the three constituent countries: Denmark, Greenland and the Faroe Islands. Before the creation of the modern office, the kingdom did not initially have a head of government separate from its head of state, namely the monarch, in whom the executive authority was vested. The Constitution of 1849 established a constitutional monarchy by limiting the powers of the monarch and creating the office of premierminister. The inaugural holder of the office was Adam Wilhelm Moltke.