The Witcher (Polish: Wiedźmin, pronounced [ˈvʲɛd͡ʑmʲin]) is a series of 6 fantasy novels and 15 short stories written by Polish author Andrzej Sapkowski. The series revolves around the titular "witcher", Geralt of Rivia. In Sapkowski's works, "witchers" are beast hunters who develop supernatural abilities at a young age to battle wild beasts and monsters. The books have been adapted into a film (The Hexer), two television series (The Hexer and The Witcher), a trilogy of video games (The Witcher, The Witcher 2: Assassins of Kings, and The Witcher 3: Wild Hunt), and a graphic novel series. The series of novels is known as the Witcher Saga. The short stories and novels have been translated into numerous languages, including Chinese, English, French, German, Italian, Russian, Lithuanian, Spanish and Ukrainian.

The books have been described as having a cult following in Poland and in Central and Eastern European countries. The video games have been very successful; as of 28 May 2020, The Witcher series has sold over 50 million copies worldwide.

The Witcher (Polish: Wiedźmin [ˈvʲɛd͡ʑmʲin] (Warlock)) is a 2007 action role-playing game developed by CD Projekt Red and published by Atari on Microsoft Windows and CD Projekt on OS X, based on the novel series of The Witcher by Polish author Andrzej Sapkowski, taking place after the events of the main saga.

The story takes place in a medieval fantasy world and follows Geralt of Rivia, one of a few traveling monster hunters who have supernatural powers, known as Witchers. The game's system of moral choices as part of the storyline was noted for its time-delayed consequences and lack of black-and-white morality. The game utilizes BioWare's proprietary Aurora Engine. In 2009, a console version, The Witcher: Rise of the White Wolf, was scheduled for release using an entirely new engine and combat system. However, it was suspended as a result of payment problems with console developers Widescreen Games.

The Witcher was released in 2007 to positive reviews from critics, holding an aggregate score of 81/100 on Metacritic. Two sequels were released: The Witcher 2: Assassins of Kings in 2011 and The Witcher 3: Wild Hunt in 2015.