Marquez currently competes for Ducati satellite squad Gresini but will end his four-year stint with the team at the end of the season.
The Spaniard has been signed on a multi-year deal.
It comes as MotoGP prepares for a radical regulations overhaul that includes the reduction in engine capacity from 1000cc to 850cc.
He effectively takes the place of Ducati-bound Pedro Acosta, who will join Marc Marquez.
“We are extremely proud and happy to have secured an exceptional talent like Alex Marquez — the 2025 world championship runner-up — for our project,” said KTM motorsport director Pit Beirer.
“Alex brings not only outstanding skill and race intelligence but also determination and a winning mindset that perfectly matches our DNA.
“Together we share a clear objective: to take the KTM RC16 to the next level and fight at the very front of MotoGP.”
KTM’s other signing is expected to be VR46 rider Fabio Di Giannantonio. That will lead Brad Binder out of a ride.
Discussion about this post