The former Roman Catholic Diocese of Lombez (or Lombès) existed, with see at Lombez in the present department of Gers in Gascony, from 1317 to the Napoleonic reshuffle after the French Revolution.
When the Archdiocese of Auch was restored in 1822, it acquired most of Lombez's former territory.
Coordinates: 43°28′29″N 0°54′37″E / 43.4746°N 0.9103°E