Olivia Mehaffey (born 9 October 1998) is a professional golfer from Northern Ireland who plays on the Ladies European Tour.

[3] Mehaffey played in the Curtis Cup twice, and in 2016 at Dun Laoghaire Golf Club outside of Dublin helped lead the Great Britain & Ireland team to victory after going 3-1-1.

[2] In 2016, Mehaffey along with Leona Maguire and Annabel Wilson won the third place bronze medal for Ireland in the 2016 Espirito Santo Trophy held at Mayakoba El Camaleon Golf Club in Mexico.

[6] She took advantage of the NCAA granting an additional year of eligibility for spring-sport athletes due to COVID-19 cutting short the 2019-20 season.

She started in the Arizona Women's Classic on the Symetra Tour in March, where she finished in a share of sixth place after leading the event at the half way stage.