| A Certain Magical Index | |
|---|---|
| Season 3 | |
 Blu-ray and DVD Volume 1 cover art featuring the characters that appeared in the season | |
| Starring | |
| No. of episodes | 26 |
| Release | |
| Original network | AT-X |
| Original release | October 5, 2018 – April 5, 2019 |
| Season chronology | |
The third season of the Japanese animated television series A Certain Magical Index (also known as A Certain Magical Index III), based on the light novel of the same name, follows Toma Kamijo and Index in their journey to stop the God's Right Seat of the Roman Catholic Church and their plans that will lead to World War III. It was produced by J.C.Staff, with Hiroshi Nishikiori and Hiroyuki Yoshino serving as director and series composition writer, respectively.
Atsushi Abe and Yuka Iguchi reprise their respective roles as Kamijo and Index. They are joined by Rina Satō, Nobuhiko Okamoto, and Satoshi Hino as the season's main cast, with the latter voicing Shiage Hamazura, who appeared in the second season's final episode. A Certain Magical Index III was announced in October 2017 as part of "A Certain Project 2018" and adapts the final nine volumes of the light novel. The third season aired in Japan from October 5, 2018, to April 5, 2019, and consists of 26 episodes.