The Greatest Show on Earth was a British progressive rock band who recorded two albums for EMI's progressive rock arm, Harvest Records, in 1970. They became known for their European hit "Real Cool World", which reached #7 in the Dutch Top 40 T and was also notable for its album covers, designed by the artist group Hipgnosis.

The band had been conceived by Harvest Records in an attempt to create a horn-based rock combo such as Blood Sweat & Tears or Chicago. Band members included Norman Watt-Roy and his older brother Garth Watt-Roy, Ozzie Lane, Mick Deacon, Ian Aitcheson, Tex Philpotts, Dick Hanson, Ron Prudence and Colin Horton-Jennings. Their usual producer was EMI house producer Jonathan Peel, not to be confused with DJ John Peel.