Gustav Friedrich Dettmar Philippi (14 July 1853, in Elberfeld – 26 April 1930, in Münster) was a German archivist and historian.
He studied philology at the University of Bonn, receiving his doctorate in 1876 with a dissertation on the Tabula Peutingeriana.
[1] Following graduation, he worked as an archivist at the state archives in Münster.
[2][3] He served as chairman of the Historical Commission for Westphalia and was an honorary professor at the University of Münster.
He was also in charge of the archaeological excavation at Haltern.