The Grammy Award-winner will be joined by fellow mentors Blake Shelton and Adam Levine. A fourth coach will be named at a later date, the network said.
"I'm so excited to join 'The Voice' at NBC," Clarkson said in a statement Thursday.
"We've been going back and forth with them for years on joining their team and the timing hasn't been right until now. Ever since NBC and I worked together on my Christmas special years ago we have established an amazing relationship and I have always loved coming on to either mentor, or perform on 'The Voice' over the years. I can't wait to turn my chair and see the faces of up and coming artists that I may be able to help get that push and support they've been needing to break into this industry. Watch out Shelton... I'm comin' to win!"
"Kelly has been a part of 'The Voice' family for many years as an adviser and performer. We are thrilled she has chosen to join us as a coach to mentor the next generation through our unique vocal boot camp," added Paul Telegdy, president of the alternative and reality group at NBC Entertainment.
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