Red Bull confirmed earlier this year that Newey would be leaving the team after almost 20 years, with a plethora of teams on the grid linked with his services immediately.
Now, it has been officially announced that the 65-year-old will make the switch 15 miles down the road to Aston's Silverstone factory.
In a statement, Aston Martin confirmed that he will join the team on March 1, 2025.
Newey will join the ambitious outfit as a shareholder and managing technical partner, taking up an important role in the outfit's ambitions to one day become a world championship-winning team.
"I have been hugely inspired and impressed by the passion and commitment that Lawrence [Stroll] brings to everything he is involved with," Newey said.
"Lawrence is determined to create a world-beating team...Together with great partners like Honda and Aramco, they have all the key pieces of infrastructure needed to make Aston Martin a world championship-winning team and I am very much looking forward to helping reach that goal.”
"This is huge news," Stroll added. "Adrian is the best in the world at what he does – he is at the top of his game – and I am incredibly proud that he is joining the Aston Martin Aramco Formula 1 Team.
"It’s the biggest story since the Aston Martin name returned to the sport and another demonstration of our ambition to build a Formula 1 team capable of fighting for world championships."
Why is Adrian Newey leaving Red Bull?
Newey joined Red Bull in 2006, the team's second year competing in Formula 1.