When is Scooby Doo 3 out?

There is no official announcement for a "Scooby Doo 3". The last movie in the franchise was "Scooby-Doo! Mystery Incorporated" which aired in 2013.

However, there are several other Scooby-Doo projects in the works, including:

* Scooby-Doo! And Krypto Too!: A crossover film with DC Comics' Superman's dog, Krypto.

* Scooby-Doo!: A live-action reboot directed by James Gunn.

It's possible that a "Scooby Doo 3" could be made in the future, but for now, there are no confirmed plans.