Newton, the 2015 NFL MVP, reached agreement on a one-year, incentive-laden deal with the Patriots, league sources told ESPN's Chris Mortensen and Adam Schefter.
Newton now will compete with Jarrett Stidham for the starting job after Tom Brady left for Tampa Bay in free agency.
Here is how the NFL reacted on Sunday:
Why Cam Newton is low risk, high reward for New England
Adam Schefter breaks down how the Patriots managed to strike a deal with former MVP quarterback Cam Newton.