Sir John Silvester (7 September 1745 – 30 March 1822) Bt, FRS, FSA, DCL, was an English lawyer and Common Serjeant of London from 1790 to 1803, and Recorder of London, the senior Circuit Judge at the Central Criminal Court (the Old Bailey), from 1803 until his death in 1822.
Born in Yardley House in Chingford, Silvester was the son of Sir John Baptist Silvester M.D., FRS (died 1789), of Dutch descent and physician to the army in the Low Countries, under the Duke of Cumberland during the War of the Austrian Succession.
In 1753 aged 8 John Silvester attended Merchant Taylors' School when James Townley was the Headmaster. He took part in the theatrical activities encouraged by Townley and was Head Monitor in 1761. He attended St John's College, Oxford from 1764 and took his BCL in 1771. On qualifying in the Law he became a barrister at the Old Bailey.
Originally a City Common Pleader, in 1790 he was chosen by the City of London Corporation to take up the post of Common Serjeant of London, and, on the death of Sir John William Rose in 1803 he was appointed Recorder of London, the senior judge at the Old Bailey. As Common Serjeant Silvester was regarded as "uncouth and overly severe".