Mariia Sergeevna Tkacheva (Russian: Мария Сергеевна Ткачёва; born 17 December 2001) is a Russian tennis player.

Tkacheva has career-high rankings by the WTA of 319 singles and 362 in doubles, achieved November 2024 and November 2022, respectively.

[1] She has won six singles and 12 doubles tournaments on the ITF Women's World Tennis Tour.

[2] Tkacheva won her biggest title to date at the 2022 President's Cup, where she partnered Anastasia Zolotareva to win the doubles tournament.

[citation needed] She made her WTA Tour debut at the 2022 Chennai Open, losing to Varvara Gracheva in the first round.