Eucharius Gottlieb Rink (August 11, 1670 – February 9 1745) was a German jurist, heraldist, numismatician, imperial counsellor. His name is also spelt as Rinck, Rinckius, Rinkius. He came from the Rink von Dorstig family, that obtained a title of nobility in the 15th century.
Since 1687, he studied philosophy, political history, and state law at the University of Leipzig, then he studied at the Altorf University, where he became the professor of state law in 1707. In 1739 he was elected the member of the Prussian Royal Academy of Sciences. He had remarkable collections of coins and coat of arms. Rink introduced hatching (1726) for the tincture gray (Eisen) and carnation (Naturfarbe). He studied the old seals as a source of heraldry and claimed that the coat of arms originated in Germany.