A Certain Scientific Accelerator (Japanese: とある科学の一方通行（アクセラレータ）, Hepburn: Toaru Kagaku no Akuserarēta) is a Japanese manga series written by Kazuma Kamachi and illustrated by Arata Yamaji. It is a spin-off of A Certain Magical Index series, which focuses on Academy City's most powerful Level 5 esper named Accelerator. The manga was serialized by ASCII Media Works through their monthly magazine Dengeki Daioh from December 2013 to July 2020 and published in English by Seven Seas Entertainment. Kamachi and Teto Tachitsu wrote and illustrated its manga spin-off titled A Certain Idol Accelerator-sama, which was published from October 2015 to November 2018. An anime television series adaptation by J.C.Staff aired from July 12 to September 27, 2019.