Erika Fairweather (born 31 December 2003) is a New Zealand swimmer who competed at the 2019 World Aquatics Championships and the 2020 Summer Olympics. Fairweather was born in Dunedin, She is of mixed European and Māori descent, affiliating with Ngāi Tahu iwi. She attended Kavanagh College and was head girl in 2021. At the 2020 Tokyo Olympics, Fairweather finished second in her heat of the 400 metres freestyle, breaking the New Zealand record (set by Lauren Boyle in 2012), with a time of 4:02.28.