Sophus Frederik Kühnel (11 May 1851 – 13 October 1930) was a Danish architect best known for his design of Mejlborg and a number of other buildings in Aarhus.

He was the son of parish priest Theodor Sextus Kühnel and Betzy Larsen.

He moved to Copenhagen to study at the Royal Danish Academy of Fine Arts.

Upon graduation he found employment with Vilhelm Dahlerup and Ferdinand Meldahl in Copenhagen.

[2] Kühnel stayed in Aarhus and was responsible for a number of notable structures there.