Charles Felix (Italian: Carlo Felice Giuseppe Maria; 6 April 1765 – 27 April 1831) was the Duke of Savoy, Piedmont, Aosta and King of Sardinia from 1821 to 1831.

Carlo Felice di Savoia was born in Turin as the eleventh child and fifth son born to Victor Amadeus III of Savoy and Maria Antonia Ferdinanda of Spain. His paternal grandparents were Charles Emmanuel III of Savoy and his German wife Polyxena of Hesse-Rotenburg. His maternal grandparents were French born King Philip V of Spain and his Italian wife, Elisabeth Farnese.

He was a younger brother of two other rulers of Savoy Charles Emmanuel IV and Victor Emmanuel I. He spent his childhood with his sister Maria Carolina and his younger brother, Giuseppe Benedetto Placido, Count of Moriana, at the Castle of Moncalieri.

From his youth, Carlo Felice was reported as having a very complex character: on the one hand consistent and inflexible, private, distrustful, and impulsive, if not touchy and vindictive; on the other hand honest, sincere, and cabable of emotion and fondness. He had a clever mind, at times even ironic. He possessed a sacral conception of the monarchy and the right to reign.

During the years of the French Revolution and the Italian Campaign, Charles Felix formed part of a "parallel court" opposed to Charles Emmanuel IV's circle, along with his brother Victor Emmanuel, the latter's wife Maria Theresa, Maurizio Giuseppe Duke of Monferrat, and Giuseppe Placido, count of Moriana.

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