Samuel Greig, or Samuil Karlovich Greig (), as he was known in Russia (30 November 1735, Inverkeithing, Fife, Scotland – 15 October 1788, Tallinn, Estonia, Russian Empire) was a Scottish-born Russian admiral who distinguished himself in the Battle of Chesma (1770) and the Battle of Hogland (1788). His son Alexey Greig also made a spectacular career in the Imperial Russian Navy.