Rudolf Waldemar Rømeling Krefting (3 February 1860 – 17 August 1942) was a Norwegian dermatologist.

He was born in Kvikne.

He is particularly known for his studies of the chancroid and the coccobacillus haemophilus ducreyi.

[1] He was the father of Kristian Krefting.

This Norwegian biographical article is a stub.