Andrzej Sapkowski (Polish pronunciation: [ˈandʐɛj sapˈkɔfskʲi]; 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. He is the recipient of the David Gemmell Award and the World Fantasy Life Achievement Award.

Sapkowski novels on display occupying two shelves at an Empik bookstore in Katowice, Poland

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 third 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.

Sapkowski's books have been translated into Czech, Georgian, Hungarian, Russian, Lithuanian, German, Spanish, French, Chinese, Ukrainian, Portuguese, Finnish, Slovak, Bulgarian, Serbian, English, Italian, Dutch, Turkish, Estonian, Romanian, Korean, Swedish, Norwegian and Croatian. An English translation of The Last Wish short story collection was published by Gollancz in 2007. From 2008, the Witcher saga is published by Gollancz. The English translation of Sapkowski's novel Blood of Elves won the David Gemmell Legend Award in 2009.

In 2001, a television series based on the Witcher cycle was released in Poland and internationally, entitled Wiedźmin (The Hexer). A film by the same title was compiled from excerpts of the television series but both have been critical and box office failures.

The polish game developer, CD Projekt Red, created a role-playing game series based on The Witcher universe. The first game, titled simply The Witcher, was first released in October 2007. The sequel, The Witcher 2: Assassins of Kings was released in 2011. The third game in the trilogy, The Witcher 3: Wild Hunt, was released in May 2015.

In May 2017, Netflix commissioned The Witcher, an English-language adaptation of the book series. The Witcher television series premiered on Netflix on 20 December 2019. Sapkowski served for a while as a creative consultant on the project.