Samuel Greig, or Samuil Karlovich Greig as he is known in Russia (November 30, 1735, Inverkeithing, Fife, Scotland – October 15, 1788, Tallinn, Estonia, Russian Empire) is a Scottish-born Russian admiral who distinguishes himself in the Battle of Chesma (1770) and the Battle of Hogland (1788).

His son Alexey Greig also makes a spectacular career in the Imperial Russian Navy.