Andreas Melchior Seip Diesen (23 September 1881 – 12 November 1958) was a Norwegian physician.

He was the city physician (Norwegian: stadsfysikus) in Oslo, and member of the Administrative Council in 1940.

[2] He married Sofie Elisabeth Aars Brodtkorb in 1912.

During the early part of the German occupation of Norway, from April to September 1940, he was member of the Administrative Council, where he served as Minister of Social Affairs.

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