Madame d'Oettlinger or Baroness d'Oettlinger (fl. 1815) was the name used by a woman who was talked about as one of the agents of Napoleon. She was rumoured to have played a part in the fall of the Duke of Enghien, and of spying on the Swedish monarch during his stay in Germany. Upon the arrival of d'Oettlinger in Karlsruhe, the Swedish Countess Caroline Lewenhaupt, then living in Strassburg, wrote to her friend Countess Gyldenstolpe: Madame d'Oettlinger was observed in Paris by the Swedish nobleman De la Gardie in 1815.