Easther Kellsy Philomene Mayi Kith (born 28 March 1997) is a professional footballer who plays as a centre-back for French Première Ligue club Saint-Étienne.

Born in Canada to Cameroonian parents, she plays for Cameroon women's national team.

Her first and only collegiate career assist was on an equalizing goal in the 2016 NCAA Division I women's soccer tournament championship match, and she scored in a penalty shoot-out to help West Virginia advance in the 2017 NCAA Division I women's soccer tournament round of 16.

[6] She also played for French clubs Metz and Reims before moving to Kristianstads DFF of the Swedish Damallsvenskan in 2022 and making nine appearances there.

[7][8] On 2 July 2024, Mayi Kith was one of the players released by Reading following their voluntary demotion to the fifth tier Southern Region Women's Football League.