"One Day" is a song performed by American reggae singer Matisyahu, first released in 2008, his first single since "Jerusalem ". The song was also included as a last-minute addition to Matisyahu's album Light. The song expresses a hope for an end to violence, and a prayer for a new era of peace and understanding. It appeared on the Modern Rock Chart at number 21 and at number 38 on the US Rock Chart; also in March 2009 it debuted on the Billboard Hot 100 at number 90 and reached number 85.

Matthew Paul Miller, known by his stage name Matisyahu, is an American reggae singer, rapper, beatboxer, and musician.