Charles-Auguste Questel (19 September 1807 – 30 January 1888) was a French architect and teacher.
As well as designing new buildings, his projects included the preservation of historical monuments.
Born in Paris, Questel was a student of Félix Duban at the École nationale supérieure des Beaux-Arts, and took a second-place Prix de Rome in 1844.
Among his students were Henri Paul Nénot, Ernest Sanson, James Freret, Eugène Train and the Swiss architect Alfred Friedrich Bluntschli; he was the father-in-law of French architect Honoré Daumet.
Upon his death the atelier was taken over by Jean-Louis Pascal.