Collider has published a ranked list of the 20 longest-running anime television series, aimed at helping fans decide whether committing to shows with hundreds or even thousands of episodes is worthwhile. The article notes that long-running anime is a distinctive feature of the medium, with some of the most episode-heavy series, such as One Piece and Naruto, also being among the most globally popular, while many other long-runners are lesser-known children's or educational programmes.

The list spans genres from battle shounen to family sitcoms and historical comedies, several of which remain in production decades after launch. Lower-ranked entries include the educational family series Oyako Club (1994–2013), the historical gag comedy Ojarumaru (1998–present), the ninja-school comedy Nintama Rantarou (1993–present, the second-longest anime overall), and the alien-invasion comedy Sgt. Frog (2004–2010).

– A ranked countdown of anime's 20 longest-running television series
– Includes globally popular titles like One Piece and Naruto
– Many long-runners are children's or educational shows, e.g. Oyako Club, Ojarumaru
– Nintama Rantarou (1993–present) cited as the second-longest anime ever
– Several featured series are still airing new episodes today