Louis I (1272 – 22 July 1322) was suo jure count of Nevers and jure uxoris count of Rethel.
Louis was a son of Count Robert III of Flanders, and Countess Yolande of Nevers. He succeeded his parents as Count of Nevers. In December 1290, he married Countess Joan of Rethel, and thus became her co-ruler in the County of Rethel. They had two children:
Joan of Flanders
Louis I, Count of Flanders, Nevers and Rethel
He died in Paris shortly before his father and thus never succeeded his father as Count of Flanders.