Vieira, 59, served as moderator of "The View" from 1996 to 2006 and co-anchor of "Today" from 2006 to 2011.
She left "Today" to spend more time with her family and has since worked as a special correspondent for NBC News.
Vieira has won two Daytime Emmy Awards as emcee of the syndicated version of the game show "Who Wants to Be a Millionaire" on which she has appeared from 2002 until this year.
"As a journalist on 'Today' and '60 Minutes,' I learned how to really listen to people and help give them a voice," Vieira said in a statement to EW.com Tuesday. "On 'The View,' I unleashed my own opinionated self and discovered the empowerment that comes with sometimes heated, but always respectful, discussion. And on ['Who Wants to Be a] Millionaire,' I relished the joy of changing people's lives while having pure fun. All of these experiences, along with being a wife and mom, have led me here because they all share one common denominator ... this fundamental need we have to connect with and find inspiration in each other. Each day, I hope to accomplish what I call the three H's: heat, heart and humor. And speaking of the heart, I want to thank my husband, Richard, and kids, Ben, Gabe and Lily, for strongly encouraging me to take this incredible opportunity ... or else they really just want to get me out of the house."