Louis I (1272 – 22 July 1322) was suo jure Count of Nevers and jure uxoris Count of Rethel.

Louis was a son of Robert III, Count of Flanders,[1] and Yolande, Countess of Nevers.

[2] He succeeded his parents as Count of Nevers.

In December 1290, he married Joan, Countess of Rethel,[3] and thus became her co-ruler in the County of Rethel.

They had two children: He died in Paris shortly before his father and thus never succeeded his father as Count of Flanders.