Leon George Thomas III (born August 1, 1993) is an American singer, songwriter, record producer, and actor. After early roles in Broadway and providing the singing voice of Tyrone on the Nick Jr. animated series The Backyardigans (2006–2008), he played Andre Harris on the Nickelodeon series Victorious (2010–2013), for which he received an NAACP Image Award nomination.

Thomas signed with Columbia and Rostrum Records following his successful productions as a member of the production duo, the Rascals. His album credits include former Victorious co-star Ariana Grande's Positions (2020), Drake's Certified Lover Boy (2021), ¥$'s Vultures 1 (2024), and Toni Braxton and Babyface's Grammy Award-winning Love, Marriage & Divorce (2014). Thomas earned a nomination for Best Rap Song at the 62nd Annual Grammy Awards for co-writing "Gold Roses" by Rick Ross. He later won Best R&B Song at the 66th Annual Grammy Awards for his contributions to the song "Snooze" by SZA.