Ryan McCartan (born June 14, 1993) is an American actor and singer. He portrays Diggie Smalls on Disney Channel original series, Liv and Maddie. In 2015, he and Liv and Maddie co-star (and his ex-fiancée) Dove Cameron guest starred in an episode of Austin & Ally.

He also performed as Flynn Rider and a dancer in the Disneyland show, Mickey and the Magical Map, back in 2013.