Andrzej Sapkowski (born 21 June 1948) is a Polish fantasy writer. He is best known for his book series The Witcher, which has been translated into 37 languages making him the second most-translated Polish science fiction and fantasy writer after Stanisław Lem. His books sold over 15 million copies.

Sapkowski studied economics at the University of Łódź, and before turning to writing, he had worked as a senior sales representative for a foreign trade company. He started his literary career as a translator, in particular, of science fiction. He says he wrote his first short story, The Witcher ("Wiedźmin", also translated "The Hexer" or "Spellmaker") on a whim, in order to enter a contest by Polish science fiction and fantasy magazine Fantastyka. In an interview, he said that being a businessman at the time and thus familiar with marketing, he knew how to sell, and indeed, he won the 3rd prize. The story was published in Fantastyka in 1986 and was enormously successful both with readers and critics. Sapkowski has created a cycle of tales based on the world of "The Witcher", comprising three collections of short stories and six novels. This cycle and his other works have made him one of the best-known fantasy authors in Poland in the 1990s.

The main character of "The Witcher" is Geralt of Rivia, a monster hunter trained for this since childhood. Geralt exists in a morally ambiguous universe, yet manages to maintain his own coherent code of ethics. At the same time cynical and noble, Geralt has been compared to Raymond Chandler's signature character Philip Marlowe. The world in which these adventures take place is heavily influenced by Slavic mythology.