John St Barbe (1742-1816) was a prominent English shipbroker and shipowner active in whaling, the transport of convicts, and the slave trade. He was a former member of the British Royal Navy and also offered the services of ship's husband and insurance broker. He appears to have owned at various times a cumulative total of nine to 11 vessels.
St Barbe was one of the owners of Sandown, a slave ship whose voyage of 1793-4 to Sierra Leone and then Jamaica, and then back to London, her captain, Samuel Gamble, recorded. The voyage was unprofitable and this appears to be the only slave vessel under his ownership, and this is appears to be her only such voyage.