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Louis (1364 – 11 December 1418) was the Lord of Piedmont and titular Prince of Achaea from 1402. He was a son of James of Piedmont and Marguerite de Beaujeu (1346 † 1402).

In 1405, he founded the University of Turin. On 24 January 1403, he married Bona (1388 – 1432), daughter of Amadeus VII of Savoy, but they never had any children. When he died in 1418, the Piedmont-Achaea cadet branch of the House of Savoy died with him. His titles and estates were inherited by his brother-in-law Amadeus VIII of Savoy.