Authors' Calendar: Gotthold Ephraim Lessing (1729-1781): Biography of the Enlightenment figure, with bibliography.
Gotthold Lessing: A biography of the German dramatist.
Lessing, Gotthold Ephraim (1729-1781): Fairly lengthy biographical entry for the German critic and dramatist, from the 1911 Encyclopædia Britannica. Includes bibliography.
Lutherstadt Wittenberg: Gotthold Ephraim Lessing: Brief biography of the playwright.
Moonstruck Drama Bookstore: Gotthold Ephraim Lessing: Biography of German dramatist.
Theatre Database: Gotthold Ephraim Lessing (1729-1781): A biography of the German dramatist and analysis of his theory of drama.
Wikipedia: Gotthold Ephraim Lessing: Introduction to the life and works of this eighteenth-century German writer.