Ousmane N'Diaye (born March 19, 2004) is a Senegalese professional basketball player for Vanoli Cremona of the LBA.
In 2016, he was announced as one of 87 participants in the Basketball Without Borders camp in Angola. In February 2020, the then 15-year old N'Diaye was highlighted by ESPN. He was described as "one of the best long-term prospects we evaluated."
On April 24, 2023, N'Diaye declared for the 2023 NBA draft but withdrew before the deadline.
On July 23, 2025, N'Diaye signed with Vanoli Cremona.