The Fab Four is a California tribute band, later starring in a theatrical production, paying homage to the Beatles. They are based in Orange County, California. Founded in November 1997 by Westminster-born John Lennon impersonator Ron McNeil (born Ronald Mendonça), and Los Angeles-born Paul McCartney impersonator Ardavan Sarraf, the group began performing Beatles music throughout Southern California and later the U.S. West Coast. They have performed worldwide in Japan, Malaysia, France, Hong Kong, the United Kingdom, Germany, Australia, Mexico, and Brazil, covering nearly the entire Beatles songbook and material from some of the Beatles' members' solo projects.

The show is a faithfully detailed chronological history of the Beatles from their first appearance on The Ed Sullivan Show to their breakup in 1970. The show has brief on-stage banter and interactions with the audience directly, but otherwise very little dialogue, mainly reenacting songs that the Beatles performed live along with songs from the members' solo works after the breakup. The band never uses pre-recorded tracks or a fifth member, relying on the members to use keyboards to produce background instruments in songs like "Strawberry Fields Forever".

Since then, the Fab Four became globally famous and received critical acclaim from critics, audiences, and fans for its faithful recreation of the Beatles' live performances. The band has since toured across the U.S. and Canada, and occasionally performed outside North America. The band is considered by several news outlets and critics to be one of the best Beatles tribute bands of all time, with their main competitor being Rain: A Tribute to The Beatles.

According to the Los Angeles Times, the band was nicknamed "The Best Beatles Show in The World." According to Sarraf, Paul McCartney's touring band has copies of the Fab Four's CDs on their tour bus.