Rippon is an Olympic figure skater who won a bronze medal in the team event at the 2018 Pyeongchang Winter Olympics. He competed in and won Dancing with the Stars Season 26 with Jenna Johnson.
Chmerkovskiy is a longtime Dancing with the Stars pro who was most recently paired with Victoria Arlen in Season 25. Moore is an Emmy Award-winning choreographer known for her work on the film La La Land.
Good Morning America confirmed the news on its official Twitter account Monday.
"Here they are America! The judges for @DancingABC Juniors REVEALED! Adam Rippon @Adaripp Mandy Moore @nopenother Val Chmerkovskiy @iamValC #DWTSJuniors #DWTS," the show wrote.
Dancing with the Stars: Juniors will pair a number of celebrity kids with young professional dancers. The series will premiere Oct. 7 on ABC.