Jean Dassier was a Genevan engraver and medallist.
Dassier was born in Geneva, and his father was the official Mint Engraver for the Republic of Geneva. In 1703 Dassier married Anne Prevost-Gaudy, and they had two sons. He studied in Paris with Jean Mauger and Joseph Roettiers, and he became an assistant to his father. In 1712 Dassier was admitted as a master in the guild of goldsmiths. In 1720 he succeeded his father as the official engraver for Geneva. He was appointed to the Council of Two Hundred in 1738. Dassier died on November 12, 1763.
On his death, his son Jacques-Antoine Dassier took over as the chief engraver of Geneva currency.