Oumar Sako (born 4 May 1996) is a professional footballer who plays as a defender for Russian club Rostov.

[1][2][3] Born in the Ivory Coast, he represented it internationally, before switching allegiance to the Niger national team in 2024.

On 30 January 2024, Sako joined Russian Premier League club Rostov on loan.

[5] Sako made his debut for the Ivory Coast national team on 22 September 2019 in a CHAN qualifier against Niger.

[7] Sako made his debut for Niger on 9 September 2024 in a Africa Cup of Nations qualifier against Ghana at the Berkane Municipal Stadium in Morocco and scored the equalizing goal in a 1–1 draw.