Ari Staprans Leff (born August 8, 1994), known by his stage name Lauv, is an American musician. His debut EP titled Lost in the Light was released in 2015. He is best known for his 2017 single, I Like Me Better & The Other which charted at #17 in Billboard's Spotify Velocity.

Interested in music from a young age, the San Francisco-born Leff took piano and viola lessons as a child before picking up the guitar around age 11. During high school, he played in several bands and studied jazz before discovering electronic music production. However, it was while attending N.Y.U. as a music tech major in 2014 that a bad breakup found Leff on his own and digging deep into his writing and recording process. Out of this period came the song "The Other," co-written with songwriter/instrumentalist Michael Matosic. Released under Leff's stage name Lauv (inspired by the Latvian "lauve" or lion), the song went viral after gaining blog attention and peaked at number three on blog aggregator Hype Machine. In 2015 he returned with his debut EP, Lost in the Light, which featured "The Other."