Ositadinma "Osi" Umenyiora (pronounced /OH-see oo-men-YUR-ah/) (born November 16, 1981 in Golders Green, London, England) is an American football defensive end in the National Football League for the New York Giants. Umenyiora is one of three British born players to have won a Super Bowl ring, joining Scott McCready and Giants teammate Lawrence Tynes. He missed the 2008 season, undergoing surgery for knee cartilage damage suffered during an exhibition against the New York Jets.

Umenyiora was born in London to Nigerian parents. His family moved back to Nigeria and later to Auburn, Alabama, where he started playing football in high school. Of Igbo descent, his full first name means in Igbo "from today things will be good".

He currently resides in Atlanta, Georgia and Edgewater, New Jersey.