Is the attack on titan manga complete?


I finished season 2 of attack on titan but I don't know how far ahead the
manga goes in comparison to the show.




No, the manga is still being published.

If you'd like to start reading it, [this
question](https://anime.stackexchange.com/q/40922/17758) asks about where the
second season of the anime leaves off in relation to the manga.

