Fate/kaleid liner Prisma Illya

Fate/kaleid liner Prisma Illya (Japanese: Fate/kaleid liner プリズマ☆イリヤ, Hepburn: Feito Kareido Rainā Purizuma Iriya) is a Japanese manga series by Hiroshi Hiroyama (also known as KALMIA), serialized in Kadokawa Shoten's Comp Ace magazine from 2007 to 2008. It is an alternate universe spin-off of the Fate/stay night visual novel by Type-Moon, with Illyasviel von Einzbern as the protagonist. Various other characters from Fate/stay night and its sequels and spin-offs also appear. A second manga series titled Fate/kaleid liner Prisma Illya 2wei (Fate/kaleid liner, プリズマ☆イリヤ ツヴァイ！) was serialized from 2009 to 2012. A third manga series titled Fate/Kaleid liner Prisma Illya 3rei!! (Fate/kaleid liner, プリズマ☆イリヤ ドライ！！) began serialization in 2012.

A 10-episode anime television series adaptation by Silver Link aired on Tokyo MX between July and September 2013. A second season, adapting the sequel manga, aired between July and September 2014. A third season titled Fate/kaleid liner Prisma Illya 2wei! Herz! began airing in July 2015. A fourth season titled Fate/kaleid liner Prisma Illya 3rei!! aired between July and September 2016. An animated film was released in 2017. An OVA titled Fate/kaleid liner Prisma Illya: Prisma Phantasm was released on June 14, 2019. A second film titled Fate/kaleid liner Prisma Illya: Licht - The Nameless Girl was released on August 27, 2021, and featured the same director, scriptwriter, character designer, and studio as the previous film. A sequel has also been announced.

A video game adaptation titled Prisma Illya (プリズマ☆イリヤ), published by Kadokawa Games for the Nintendo 3DS, was released in Japan on July 31, 2014.