Armagnac may refer to:
- County of Armagnac, a province of France
- Count of Armagnac
- House of Armagnac, a French noble house
- Armagnac (party), a prominent French political party during the Hundred Years' War
- Armagnac (brandy), a type of brandy
- Armagnac battalion, a resistance group in Toulouse organized by George Reginald Starr in advance of the Normandy invasion
- SNCASE Armagnac, a large French airliner of the late 1940s