Rio Mangini is the son of Academy Award-winning sound editor Mark Mangini. His father is of Italian descent. His mother is of Māori and German descent.
Mangini is a pianist. He placed first in the 2011 Cypress College Competition (8-year-old division) and received an honorable mention in the 2011 American Protege International Piano Strings Competition. As a pianist, he was awarded by Young Artist Awards in 2012 with a special award in the category "Outstanding Instrumentalist".
In 2012, Mangini starred as Jax in Lisanne Sartor's short film Six Letter Word. The film made it through the Emerging Filmmaker Showcase in 2013 to the Cannes Film Festival. In 2013, he appeared in various films and television projects including The Garcias Have Landed, Marvin Marvin, What If, and Kickin' It. In 2014, Mangini appeared in Good Luck Charlie, Switched at Birth, Doc McStuffins, and See Dad Run. He also appeared in the films Pizza Bear Delivery Challenge, The Little Rascals Save the Day, and Finders Keepers. He appeared in One Crazy Cruise, Miles from Tomorrowland, and Bella and the Bulldogs in 2015, Teen Wolf in 2016, and General Hospital in 2017.

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