Jakob Jensen (15 November 1858 – 5 October 1942) was a Danish politician and the first elected mayor of Aarhus, Denmark. Jakob Jensen was born in Helgenæs on Djursland where he grew up on the family farm but he later moved to Aarhus where he worked as a mason and later as a politician. He founded the local mason's union, was involved in numerous organizations and during his tenure as mayor he was instrumental in expanding the Port of Aarhus and getting the University of Aarhus established. Jakob Jensen was a member of the Danish Social Democratic Party.