The Life of Samuel Johnson, LL.D. (1791) is a biography of Dr. Samuel Johnson written by James Boswell. It is regarded as an important stage in the development of the modern genre of biography; many have claimed it as the greatest biography written in English. While Boswell's personal acquaintance with his subject only began in 1763, when Johnson was 54 years old, Boswell covered the entirety of Johnson's life by means of additional research. The biography takes many critical liberties with Johnson's life, as Boswell makes various changes to Johnson's quotations and even censors many comments. Regardless of these actions, modern biographers have found Boswell's biography as an important source of information on Johnson and his times. The work was popular among early audiences and with modern critics, but some of the modern critics believe that the work cannot be considered a proper biography.

James Boswell was a British lawyer, diarist, and author born in Edinburgh, Scotland. He is best known for the biography he wrote of one of his contemporaries, the English literary figure Samuel Johnson, which the modern Johnsonian critic Harold Bloom has claimed is the greatest biography written in the English language.