Mei Yamaguchi (山口 芽生, Yamaguchi Mei, born 14 June 1999) is a Japanese tennis player.

Yamaguchi has a career-high singles ranking of 334 by the WTA, achieved on 4 November 2024, and a best WTA doubles ranking of 649, set in July 2021.

[1] Yamaguchi made her WTA Tour main-draw debut at the 2024 Toray Pan Pacific Open, losing to Bianca Andreescu in the first round.

[2]