On 8 November 2012, he was called up to the England under-21 team for the first time for a friendly against Northern Ireland. He made his debut in the game, coming on as a substitute in the 83rd minute for Jack Robinson. He was recalled to the under-21 squad in November 2013. Moore helped England reach the 2015 UEFA European Under-21 Championship by scoring in the second leg of the play-offs, which England won 2–1 against Croatia. England had already won the first leg 2–1, which meant they progressed to the finals with a 4–2 aggregate win. He went on to make ten appearances and scoring once for the U21 side.