Warning may refer to:
- Warning! posting on Hierarch Square's notice board
- or Warning For New Arrivals posting on the same board
- Warning! posting on Seven Cats Inn's notice board
- Warning to Defeatists posting on Nilfgaardian Army Group 'Center' Camp's notice board
- Warning from the Nilfgaardians posting on Oreton's notice board
- Warning, a note in the Blood and Wine expansion for The Witcher 3: Wild Hunt
- Warning letter, a note in the Hearts of Stone expansion for The Witcher 3: Wild Hunt