Guillermo del Toro Gómez (born October 9, 1964) is a Mexican film director, screenwriter, producer, and novelist. In his filmmaking career, del Toro has alternated between Spanish-language dark fantasy pieces, such as the gothic horror film The Devil's Backbone (2001), and Pan's Labyrinth (2006), and more mainstream American action movies, such as the vampire superhero action film Blade II (2002), the supernatural superhero film Hellboy (2004), its sequel Hellboy II: The Golden Army (2008), and the science fiction monster film Pacific Rim (2013).

In addition to his directing works, del Toro is a prolific producer, his producing works including acclaimed and successful films such as The Orphanage (2007), Julia's Eyes (2010), Biutiful (2010), Kung Fu Panda 2 (2011), Puss in Boots (2011), and Mama (2013). He was originally chosen by Peter Jackson to direct The Hobbit films; he left the project due to production problems but was still credited as co-writer for his numerous contributions to the script.

Del Toro's work is characterised by a strong connection to fairy tales and horror, with an effort to infuse visual or poetic beauty. He has a lifelong fascination with monsters, which he considers symbols of great power. Del Toro is known for his use of insectile and religious imagery, the themes of Catholicism and celebrating imperfection, underworld and clockwork motifs, practical special effects, dominant amber lighting, and his frequent collaborations with actors Ron Perlman, Doug Jones and Federico Luppi. He is also friends with fellow Mexican directors Alfonso Cuarón and Alejandro González Iñárritu, collectively known as "The Three Amigos of Cinema." In 2018, he won the Academy Awards for Best Picture and Best Director for his romantic fantasy, "The Shape of Water."