Alexander Medawar Garland (born 26 May 1970) is an English author and filmmaker. He rose to prominence with his novel The Beach (1996). He received praise for writing the Danny Boyle films 28 Days Later (2002) and its sequel, 28 Years Later (2025), and Sunshine (2007), as well as Never Let Me Go (2010) and Dredd (2012). In video games, he co-wrote Enslaved: Odyssey to the West (2010) and was a story supervisor on DmC: Devil May Cry (2013).

Garland made his directorial debut when he wrote and directed the sci-fi thriller Ex Machina (2014). He earned an Academy Award nomination for Best Original Screenplay, and won three British Independent Film Awards, including Best Screenplay, Best Director, and Best British Independent Film for the film. His second film, Annihilation (2018), an adaptation of the 2014 novel, was a critical success. He wrote, directed and executive produced the FX miniseries Devs (2020) followed by the horror thriller Men (2022), and the dystopian action thriller Civil War (2024). He also co-directed the war film Warfare (2025). The three films were produced by A24.

Alexander Medawar Garland was born in London on 26 May 1970, the son of psychologist Caroline (née Medawar) and political cartoonist Nicholas Garland. Alexander has a younger brother and two older paternal half-siblings. He is the maternal grandson of writer Jean Medawar and Nobel Prize-winning biologist Peter Medawar. Garland was educated at University College School in Hampstead and graduated from the University of Manchester in Manchester with an art history degree.

Garland's first novel, The Beach, was published in 1996. Based on his travels across Europe and Thailand, it tells the story of a young English backpacker who discovers an unspoiled seashore occupied by a community of like-minded backpackers. The novel is noted for its references to drug culture, sequences of hallucinations, and unique depictions of excess and utopia. The Beach was initially met with positive reviews, and with a spreading word of mouth response, the novel grew in popularity; it led some critics to regard Garland a key voice of Generation X. He would later speak of his discomfort with the fame The Beach brought him. The Beach has been translated into 25 different languages and sold close to 700,000 copies by the start of 1999. It was developed into 2000 film starring Leonardo DiCaprio. In 2003, the novel was Ranked 103 in BBC's The Big Read poll.

Garland's The Tesseract (1998) is a non-linear narrative with several interwoven characters, set in Manila, Philippines. The novel is characterized by a post-modernist narrative style and structure. It explores several themes such as love and violence through each character's circumstance and context of surroundings as well as seemingly inconsequential actions and the repercussions of those actions on other characters. The Tesseract was not a critical or commercial success, but it too was adapted into a film. Throughout his work, Garland has expressed his love of travel (particularly backpacking) and his love of Manila, much of which influenced his work.

In 2002, Garland wrote the screenplay for Danny Boyle's film 28 Days Later, starring Cillian Murphy. He has said that the script was influenced by 1970s zombie films and English science fiction such as The Day of the Triffids. The Resident Evil video game series also influenced 28 Days Later, with Garland crediting the first game for revitalising the zombie genre. Inspiration for the "Rage" virus came from real-world infections such as Ebola and filoviruses. He won a Best Screenplay honor at the 2004 Fangoria Chainsaw Awards for his script of the film.

In 2005, Garland wrote a screenplay for a film adaptation of Halo. D. B. Weiss and Josh Olson rewrote this during 2006 for a 2008 release, although the film was later canceled. In 2007, he wrote the screenplay for the film Sunshine, which was his second screenplay to be directed by Danny Boyle and to star Cillian Murphy. Garland served as an executive producer on 28 Weeks Later, the sequel of 28 Days Later. He wrote the screenplay for the 2010 film Never Let Me Go, based on the novel by Kazuo Ishiguro. He also wrote the script for Dredd, an adaptation of the Judge Dredd comic book series from 2000 AD. In 2018, Karl Urban, who played the eponymous role in the film, stated that it was Garland who deserved credit for also directing Dredd.

Garland made his directorial debut with Ex Machina, a 2014 feature film based on his own story and screenplay, starring Domhnall Gleeson, Alicia Vikander and Oscar Isaac. The film won a Jury Prize at the 2015 Gerardmer Film Festival, and earned Garland a nomination for an Academy Award for Best Original Screenplay. Garland's second film, Annihilation (2018), was based on the 2014 novel by Jeff VanderMeer. Garland described it as "an adaptation [that] was a memory of the book", rather than book-referenced screenwriting, to capture the "dream like nature" and tone of his reading experience. Production began in 2016, and the film was released in February 2018. Also in 2018, it was reported that Garland had written a fantasy film script titled The Toymaker's Secret, and centering around a toymaker whose creations come to life and co-exist with him peacefully until a young woman and her kid move in.