Tatjana Kosmõnina (born December 2, 1980) is an Estonian actress and director.

She graduated from the St. Petersburg State Theater Academy in 2003 (in the class of Gennady Trostjanetsky). She has worked at Estonian Television as an announcer of the Russian-language dub of "Aktuaalne Kaamera".

Since 2013, she has been working at the Russian Theatre.