Jeff Montalvo (born March 31, 1987), known professionally as Seven Lions, is an American DJ, record producer, instrumentalist and remixer from Santa Barbara, California. Active musically since 2010, his music combines styles as diverse as trance, melodic dubstep, drum and bass, glitch hop, and electro house. He has released eight EPs, multiple singles, and official remixes for record labels such as Casablanca Records, Owsla, Viper Recordings, Anjunabeats, Republic Records and Monstercat.

His second EP Days to Come was mentioned by Vibe Magazine as one of their Top Electronic Albums of 2012, and it peaked at No. 10 on the Billboard Dance/Electronic Albums chart. His next EP, Worlds Apart, charted at No. 76 on The Billboard 200, and the EP's track "Don't Leave" with Ellie Goulding entered the UK Singles Chart in 2014. He tours regularly in the United States, and since 2012 has performed at festivals such as SXSW, Ultra Music Festival, Electric Daisy Carnival, Electric Zoo, and Camp Bisco. He was nominated for America's Best DJ, a competition held by DJ Times, in 2014. In 2018, Seven Lions founded Ophelia Records, an independent record label that releases various electronic dance music, including dubstep, psytrance, drum & bass, and melodic bass.