Mary Onyali-Omagbemi (born February 3, 1968) is a Nigerian sprinter, who won the bronze medal in the 4 x 100 m relay at the 1992 Summer Olympics and in the 200 m at the 1996 Summer Olympics. She also won the 1994 Commonwealth Games. Onyali-Omagbemi performed especially well in the All-Africa Games, winning a total of 7 individual medals in the short sprints. She won 100 m in 1991, 1995 and 2003 and took a bronze medal in 1987. Gold medals in 200 m were taken in 1987, 1995 and 2003. Furthermore, the Nigerian 4 x 100 m relay team won all races between 1987 and 2003, at the African Games.