Erina Hayashi (? ???, Hayashi Erina, born 21 July 1994) is a Japanese female tennis player.
She has career-high WTA rankings of 403 in singles, achieved on 29 July 2019, and 307 in doubles, set on 5 August 2019, and has won one singles title and five doubles titles on the ITF Women's Circuit.
Hayashi made her main-draw debut on the WTA Tour at the 2017 Japan Women's Open, where she received a wild card alongside Momoko Kobori in the doubles draw.