Tatjana Lematschko (born March 16, 1948 in Moscow) is a Swiss chess player, originally Russian but lived in Bulgaria for several years.
She has won both the Women's Bulgarian Chess Championship and Swiss Chess Championship several times.
She has competed for the world championship, most recently in the Women's World Chess Championship 1999.
At the 27th Chess Olympiad she won a medal for the best performance on no. 1 board.