Lugdunum is a classical Roman place name, most commonly referring to one of two places:
- Lugdunum, Gaul; now Lyon, France
- Lugdunum Batavorum, a castellum on the mouth of the Rhine river near Katwijk, Netherlands
Other places:
- Lugdunum Convenarum, now Saint-Bertrand-de-Comminges, France
- Lugdunum Clavatum, now Laon, France
- Lugdunum Consoranorum, now Saint-Lizier, France
Lugdunum may also refer to:
- Lugdunum (museum), formerly the Gallo-Roman Museum of Lyon-Fourvière, in Lyon, France
- Lugdunum Server, a server software for the EDonkey network