Nkemdilim “Mary” Onyali-Omagbemi (née Onyali, born 3 February 1968) is a Nigerian former sprinter, she was a 5x Olympian 1988 - 2004.

Onyali-Omagbemi performed especially well in the All-Africa Games, winning a total of 7 individual medals in the short sprints.

Competing for the Texas Southern Tigers track and field program, she won an NCAA title in the 200 metres.

[2] This feat was equalled by table tennis players Bose Kaffo and Segun Toriola four years later in Beijing, PR China.

On the 21st of September 2020, she was made one of the ambassadors of the re-branded National Principal's Cup; a grassroots championship tournament that was popular across Nigeria that discovered many talents, some who were former Super Eagles stars.