Louis Victor of Savoy (25 September 1721 – 16 December 1778) headed a French cadet branch of the Italian dynasty which reigned over the Kingdom of Sardinia, being known as the Prince of Carignano from 1741 till his death. Upon extinction of the senior line of the family, his great-grandson succeeded to the royal throne as King Charles Albert of Sardinia, while his great-great-grandson, Victor Emmanuel II, became King of Italy.

Louis Victor was born at the Hôtel de Soissons, the Parisian home of his ancestor Marie de Bourbon, to Victor Amadeus I, Prince of Carignano and his wife Maria Vittoria of Savoy. His father was a grandson of Thomas Francis, Prince of Carignano and thus a descendant of Charles Emmanuel I, Duke of Savoy and Infanta Catherine Michelle of Spain. He was doubly descended from the latter pair, as his mother was a legitimated daughter of Victor Amadeus II of Sardinia and his mistress Jeanne Baptiste d'Albert de Luynes.

One of five children, he was the second son of his parents; his older brother Joseph Victor had died in 1716, aged 5 months. Louis Victor was thus heir to the cadet branch of the House of Savoy-Carignano from birth. His older sister Anne Thérèse married the Frenchman Charles de Rohan and was Princess de Soubise by marriage. Anne Thérèse was the mother of Madame de Guéméné, official governess to the children of Marie Antoinette and Louis XVI.

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