John Palmer of Bath was a theatre owner and instigator of the British system of mail coaches that was the beginning of the great British post office reforms with the introduction of an efficient mail coach delivery service in Great Britain during the late 18th century. He was Mayor of Bath on two occasions and Comptroller General of the Post Office, and later served as Member of Parliament for the constituency of Bath between 1801 and 1807.

A mail coach is a stagecoach that is used to deliver mail. In Great Britain, Ireland, and Australia, they were built to a General Post Office-approved design operated by an independent contractor to carry long-distance mail for the Post Office. Mail was held in a box at the rear where the only Royal Mail employee, an armed guard, stood. Passengers were taken at a premium fare. There was seating for four passengers inside and more outside with the driver. The guard's seat could not be shared. This distribution system began in Britain in 1784. In Ireland the same service began in 1789, and in Australia it began in 1828.