Jens Arnold Diderich Jensen (24 July 1849 in Flensburg – 24 November 1936 in Copenhagen) was a Danish naval officer and Arctic explorer.
Jensen assisted the geological exploration along the Greenland west coast. He is particularly renowned for his explorations of the inland ice sheet. He led an expedition that discovered the nunataks now named J. A. D. Jensen Nunataks (J. A. D. Jensens Nunatakker) after him. The geologist of the expedtition, A. Kornerup, collected no less than 27 species of Angiosperms on the nunataks.Cape J.A.D. Jensen and the J.A.D. Jensen Fjord are also named after him.
In 1911, he changed his name to Jens Arnold Diderich Jensen Bildsøe.