Tiddis
| Ruins of Tiddis | |
| Location | Algeria | 
|---|---|
| Region | Constantine Province | 
| Coordinates | 36°27′48″N 6°29′02″E / 36.463333°N 6.483889°E | 
Tiddis (also known as Castellum Tidditanorum or Tiddi) was a Roman city that depended on Cirta and a bishopric as "Tiddi", which remains a Latin Catholic titular see.
It was located on the territory of the current commune of Béni Hamidane in the Constantine Province of eastern Algeria.