A Certain Scientific Railgun watch order

Release order

1. ·
   A Certain Magical Index

   Optional extraTV · 200824 eps9 h 12 min
2. ·
   A Certain Magical Index Specials

   Optional extraSpecial · 20092 eps16 minutes
3. 1
   A Certain Scientific Railgun

   Main storyTV · 200924 eps9 h 36 min
4. ·
   Toaru Kagaku no Railgun: Motto Marutto Railgun

   Optional extraSpecial · 20102 eps18 minutes
5. ·
   Toaru Kagaku no Railgun: Entenka no Satsuei Model mo Raku ja Arimasen wa ne.

   Optional extraOVA · 20101 eps4 minutes
6. ·
   Toaru Kagaku no Railgun: Misaka-san wa Ima Chuumoku no Mato Desukara

   Optional extraOVA · 20101 eps34 minutes
7. ·
   A Certain Magical Index II

   Optional extraTV · 201024 eps9 h 12 min
8. ·
   A Certain Magical Index II Specials

   Optional extraSpecial · 20112 eps20 minutes
9. ·
   A Certain Magical Index: The Miracle of Endymion

   Optional extraMovie · 20131 h 30 min
10. 2
    A Certain Scientific Railgun S

    Main storyTV · 201324 eps9 h 36 min
11. ·
    A Certain Scientific Railgun S Specials

    Optional extraSpecial · 20132 eps18 minutes
12. ·
    A Certain Magical Index III

    Optional extraTV · 201826 eps10 h 50 min
13. ·
    A Certain Magical Index III Specials

    Optional extraSpecial · 20192 eps18 minutes
14. 3
    A Certain Scientific Railgun T

    Main storyTV · 202025 eps10 hours
15. ·
    Toaru Kagaku no Railgun T: Motto Marutto Railgun

    Optional extraSpecial · 20202 eps20 minutes
16. 4
    Toaru Kagaku no Railgun 4th Season

    Main storyTVUpcoming

Built from AniList relation data: entries linked as direct prequels/sequels are the main story; side stories and specials are optional.