The Dulgubnii are a Germanic tribe mentioned in Tacitus' Germania (Chapter 34) as living in what is today northwest Germany.
Tacitus described them being to the north of the Angrivarii, who were neighbours of both the Bructeri on the west, between Ems, Lippe, and Weser, and the Cherusci in the east. East of the Dulgubnii themselves were the Chasuarii, near the River Hase, and north of these, on the North Sea coast, where the Chauci.
According to the account of Tacitus, the Chauci in his time (around 100 AD) lived not only along the whole German coast, but also stretched down to the lands of the Cherusci and Chatti. So they were may have also been neighbours of the Dulgubnii on the west at this time.
The Dulgubnii in Tacitus are probably the same as Ptolemy's Doulgoumnioi of the same region (Book 2, Chapter 10). (Many Germanic names are corrupted in Ptolemy's Greek.) Ptolemy describes them between the Weser and Elbe, south of the "Laccobardi" (Langobardi), who are south of the Chauci. Also near them between the Weser and Elbe are the Angrivarii.
