John Sigismund Tanner

John Sigismund Tanner (1705 – 14 March 1775; German: Johann Sigismund Tanner) was an engraver of the Kingdom of Great Britain, making dies for coins and medals.

Tanner, a native of Saxe-Coburg, worked mostly for the Royal Mint at the Tower of London and was its Chief Engraver from 1741 until his death in 1775. During his latter years he suffered from approaching blindness and many other infirmities and took little part in preparing new dies or other work, which was carried out by his chief assistant and successor Richard Yeo. Under the instruction of Master of the Mint Richard Arundell, Tanner produced replicas of Thomas Simon's coins of 1658. The wider availability of Tanner's sixpences compared to the originals led to them being nicknamed "tanners". This name preserved until decimalisation in 1971.