Christian Ditlev Ammentorp Hansen (25 February 1843 – 20 June 1916) was a Danish pharmacist and industrialist.

He also had a key role in the establishment of the Danish Pharmaceutical College in Copenhagen in 1892, financing its first building in Stockholmsgade out of his own pocket.

Hansen apprenticed as a pharmacist at the pharmacy of Frederick's Hospital in Copenhagen, 1859.

In 1972, he received the university's gold medal for Udvikling af Forholdet mellem et Stofs Krystalform og dets kemiske Sammensætning.

He then went on a journey sabbatical on a government stipend to study pharmaceutical colleges and manufacturing plants.

Back in Copenhagen, in 1876, he received a license to establish a pharmacy in the new Gammelholm neighbourhood.

He was chairman of the Foundation for the Promotion of Pharmaceutical Education in Denmark from 1891 and was the same year made an honorary members of the Danish Association of Pharmacists.

He established Maglekilde og Frederiksberg Brøndanstalt for a limited company in 1873 and for a few years after its opening served as its technical director.