Carl Looft (né Knutsen; 9 February 1863 – 10 April 1943) was a Norwegian physician, and among the first pediatricians in Norway.

He was born in Bærum to physician Carl August Knutsen and Margery Henriette Caroline Louise Thaulow, and was a grandson of Heinrich Arnold Thaulow.

In addition to his work as physician, he was responsible for a series of epidemiological investigations among children.

Among his conclusions was that appropriate nutrition during pregnancy and infancy was an important factor for the mental development of the children.

This biographical article related to medicine in Norway is a stub.