Agnelli & Nelson is the collective name of Northern Irish music producers Christoper James Agnew and Robert Frederick Nelson, writers and producers of dance music who have worked in the genre of trance music since 1997. They also produce music under the names Afterburn, Cortez, Green Atlas, Quincey & Sonance and The A & N Project. Since 1997, Agnew and Nelson have been writing and producing dance music, including their hits "El Nino" and "Everyday". They have to date produced five Top 40 hits in the United Kingdom, and countless remixes, from Armin van Buuren to U2. The pair have collaborated with other major artists, including Matt Darey, Jon the Dentist, Scott Bond, Solar Stone, and Chicane.

They have also appeared on BBC Radio 1 six times. They produced music for Xtravaganza, and labels such as Tsunami Records and ID&T.

Their remix of John O'Callaghan's "Big Sky" was voted the number one trance production on A State Of Trance in 2007, the radio show hosted by Armin Van Buuren.