Jim's Big Ego is a Boston, Massachusetts-based band formed in 1995 under the leadership of singer/songwriter Jim Infantino.

Among the band's songs are "The Ballad of Barry Allen," based on Barry Allen (The Flash), a character co-created by Infantino's uncle Carmine Infantino, and "New Lang Syne" (sometimes also called "Thank God It's Over"), a new New Year's Eve song featured on National Public Radio's All Things Considered in 2001.