"One Day" is a song sung by American reggae singer Matisyahu and written by him and the The Smeezingtons, first released in 2008, his first single since Jerusalem (Out of the Darkness Comes Light). 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 Billboard Hot 100 at number 90 and reached number 85. The song was featured on the video game NBA 2K10, which was released on October 6, 2009.

In an interview with Matisyahu "'One Day' is the song I've been wanting to make since I started my career," Matisyahu tells Spinner. "It is an anthem of hope with a big beat, the kind of song that makes you bob your head and open your heart at the same time."

The official remix for the song features Akon and was released to radio stations in May 2008. A second remix featuring Infected Mushroom was released in July 2008.

There is a version of the song featured on the Listen Up! The Official 2010 FIFA World Cup Album featuring Nameless.

The music video shows a number of people hanging and viewing posters of Matisyahu.

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