Tayisiya Morderger (born 7 March 1997) is a German tennis player.

Morderger has career-high singles ranking of world No.

400, achieved on 18 September 2017, and a best WTA doubles ranking of No.

Morderger made her WTA Tour main-draw debut at the 2020 Prague Open, partnering her twin sister Yana in the doubles event, falling to Lucie Hradecká and Kristýna Plíšková in the first round.

[2] Her twin sister, Yana Morderger, is also a tennis player.