Judit Polgár (born July 23, 1976) is a Hungarian chess grandmaster. She is by far the strongest female chess player in history. In 1991, Polgár achieved the title of Grandmaster at the age of 15 years and 4 months, the youngest person ever to do so at that time.

Polgár was ranked No. 29 in the world on the March 2012 FIDE rating list with an Elo rating of 2709, the only^[update] woman on FIDE's Top 100 Players list, and has been ranked as high as eighth (in 2005). She has won or shared first in the chess tournaments of Hastings 1993, Madrid 1994, León 1996, U.S. Open 1998, Hoogeveen 1999, Siegman 1999, Japfa 2000, and the Najdorf Memorial 2000.

Polgár is the only woman to have won a game from a current world number one player, and has defeated nine current or former world champions in either rapid or classical chess: Anatoli Karpov, Garry Kasparov, Boris Spassky, Vasily Smyslov, Veselin Topalov, Viswanathan Anand, Ruslan Ponomariov, Alexander Khalifman, and Rustam Kasimdzhanov.

Polgár was born in July 23, 1976, in Budapest, to a Hungarian Jewish family. Polgár and her two older sisters, Grandmaster Susan and International Master Sofia, were part of an educational experiment carried out by their father László Polgár, in an attempt to prove that children could make exceptional achievements if trained in a specialist subject from a very early age. "Geniuses are made, not born", was László's thesis. He and his wife Klára educated their three daughters at home, with chess as the specialist subject. László also taught his three daughters the international language Esperanto. They received resistance from Hungarian authorities as home-schooling was not a "socialist" approach. They also received criticism at the time from some western commentators for depriving the sisters of a normal childhood. However, by most reports the girls appeared happy and well-adjusted.