Ari Seth Herstand (born June 1, 1985) is an American singer-songwriter, actor, and blogger based in Los Angeles, California (previously Minneapolis, Minnesota) who specializes in live-looping of the guitar, piano, trumpet, vocals, and percussion.

Herstand is popular in the United States where he has played at Summerfest in Milwaukee, WI and the South by Southwest music festival in Austin, TX, as well as Carnegie Hall， He has played with various major artists including Ben Folds, Cake, Sister Hazel, Phil Vassar, Matt Nathanson, Joshua Radin, Eric Hutchinson, and Ron Pope， His music has been played on popular TV shows such as The Real World， One Tree Hill，Friendzone",I'm Married To A， The Real L Word， and The Hard Times of RJ Berger