Szidónia Lázárné Vajda (née Vajda; born 20 January 1979) is a Romanian-Hungarian chess player with the FIDE titles of International Master (IM) and Woman Grandmaster (WGM).

In 1995 she won the Under-16 girls' section of the European Youth Chess Championship.

She played in the bronze medal-winning Romanian team in the 3rd Women's European Team Chess Championship in Batumi 1999[1] and played for Hungary in the Women's Chess Olympiads of 2002, 2004, 2006 and 2008.

[2] In 2009, she won the 1st Teller Ede Memorial in Paks.

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