Yinka Ajayi (born 11th of August 1997) is a Nigerian sprinter specialising in the 400 metres.

She was a finalist in the 400 metres at the 2018 Commonwealth Games and went on to anchor the Nigerian 4 × 400 m relay quartet (Patience George, Glory Nathaniel, Praise Idamadudu, Ajayi) to a silver medal behind Jamaica.

[citation needed] She finished second at the 2017 Nigerian Championships in a then personal best of 51.57 s behind Patience George.

[4] In 2021, she became the first woman in the history of Drake University to represent the school in track and field at the Olympic Games.

[5] Ajayi is currently serving an eight-year competition ban (the initial four years and four more years added in 2024) set to end in January 2030 for an anti-doping rule violation after testing positive for metenolone in December 2021.